Comments on: Can someone help me with some algebra problems? http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems Fri, 03 Feb 2012 13:23:59 -0500 http://wordpress.org/?v=2.8.4 hourly 1 By: Kobayashi http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems/comment-page-1#comment-1574 Kobayashi Sat, 30 Jan 2010 10:13:59 +0000 http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems#comment-1574 ALDR and Chen-Chu have same answers, I think they are corect, I have same answers too. 1) Any number work here. 2) y = 2x+7 3) 4 4) 125% 5) 25%<br><b>References : </b><br> ALDR and Chen-Chu have same answers, I think they are corect, I have same answers too.
1) Any number work here.
2) y = 2x+7
3) 4
4) 125%
5) 25%
References :

]]> By: Chen-Chu L http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems/comment-page-1#comment-1573 Chen-Chu L Sat, 30 Jan 2010 10:02:59 +0000 http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems#comment-1573 1.) 5(x+2)-7=5x+3 5x+10-7=5x+3 5x+3=5x+3 This is an identity, so it can have any solution. Try some random values in it to test it. Let us try 1 and 2 to begin. 5(1+2)-7=5(1)+3; 5+10-7=5+3; 8=8 5(2+2)-7=5(2)+3; 10+10-7=10+3; 13=13 #2.) -8x+4y=28 4y=8x+28 y=2x+7 #3.)40(1-0.9) 40-36=4 #4.) (18-8)/8=10/8=1.25=125% #5.) ($110-$82.50)/$110=0.25 =25%<br><b>References : </b><br> 1.) 5(x+2)-7=5x+3
5x+10-7=5x+3
5x+3=5x+3
This is an identity, so it can have any solution. Try some random values in it to test it. Let us try 1 and 2 to begin.
5(1+2)-7=5(1)+3; 5+10-7=5+3; 8=8
5(2+2)-7=5(2)+3; 10+10-7=10+3; 13=13
#2.) -8x+4y=28
4y=8x+28
y=2x+7
#3.)40(1-0.9)
40-36=4
#4.) (18-8)/8=10/8=1.25=125%
#5.) ($110-$82.50)/$110=0.25 =25%
References :

]]> By: ElaineGSD http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems/comment-page-1#comment-1572 ElaineGSD Sat, 30 Jan 2010 09:28:59 +0000 http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems#comment-1572 For the first two problems, multiply out and simplify. The first one will yield something like "x = ???" Let's work through the second one. -8x + 4y = 28 we are solving for y, so let's add 8x to both sides -8x + 4y + 8x = 28 + 8x and simplify 4y = 8x + 28 now let's divide both sides by 4 4y/4 = 8x/4 + 28/4 and simplify again y = 2x + 7 The third, fourth and fifth problems are also the same, they are word problems dealing with percentages. Let's look at the third problem. Alicia spent $82.50 on a $110 dress, which means she saved $110 - $82.50 = $27.50. What percentage of $110 is $22.5? $27.5/110 = .25 and to make this a percentage, we mutliply by 100/100 .25 * (100/100) = 25 percent.<br><b>References : </b><br> For the first two problems, multiply out and simplify. The first one will yield something like "x = ???" Let’s work through the second one.

-8x + 4y = 28 we are solving for y, so let’s add 8x to both sides
-8x + 4y + 8x = 28 + 8x and simplify
4y = 8x + 28 now let’s divide both sides by 4
4y/4 = 8x/4 + 28/4 and simplify again
y = 2x + 7

The third, fourth and fifth problems are also the same, they are word problems dealing with percentages. Let’s look at the third problem.

Alicia spent $82.50 on a $110 dress, which means she saved
$110 – $82.50 = $27.50. What percentage of $110 is $22.5?

$27.5/110 = .25 and to make this a percentage, we mutliply by 100/100
.25 * (100/100) = 25 percent.
References :

]]> By: ALDR http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems/comment-page-1#comment-1571 ALDR Sat, 30 Jan 2010 09:05:59 +0000 http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems#comment-1571 1) 5(x+2)-7=5x+3 5x + 10 - 7 = 5x + 3 5x + 3 = 5x + 3 x=x could be anything 2) Solve -8x+4y=28 for y 4y = 28 + 8x y = 7 + 2x 3) Find the result when 40 is decreased by 90% 40 - 0.90(40) = 40 - 36 = 4 4) Antonio sold a hat for $18. His wholesale cost was $8. What was the percent markup? (18 - 8) / 8) = 1.25 = 125% 5) Alicia bought a prom dress that originally cost $110. After she used a coupon, she spent $82.50 on the dress. What percent discount did she receive? (110 - 82.5) / 110 = 0.25 = 25%<br><b>References : </b><br> 1) 5(x+2)-7=5x+3
5x + 10 – 7 = 5x + 3
5x + 3 = 5x + 3
x=x could be anything

2) Solve -8x+4y=28 for y
4y = 28 + 8x
y = 7 + 2x

3) Find the result when 40 is decreased by 90%
40 – 0.90(40) = 40 – 36 = 4

4) Antonio sold a hat for $18. His wholesale cost was $8. What was the percent markup?
(18 – 8) / 8) = 1.25 = 125%

5) Alicia bought a prom dress that originally cost $110. After she used a coupon, she spent $82.50 on the dress. What percent discount did she receive?
(110 – 82.5) / 110 = 0.25 = 25%
References :

]]> By: Madeline Rose http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems/comment-page-1#comment-1570 Madeline Rose Sat, 30 Jan 2010 08:44:59 +0000 http://www.stonehat.com/wholesale-hats/can-someone-help-me-with-some-algebra-problems#comment-1570 1)x=0 2)y=7+2x 3)36 4)idk im terrible at these... sry 5)75% i probably just gave you all the answers to your math homework. oh well ^_^<br><b>References : </b><br> 1)x=0
2)y=7+2x
3)36
4)idk im terrible at these… sry
5)75%

i probably just gave you all the answers to your math homework. oh well ^_^
References :

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