how do I do this?
2006-11-09 11:19:31 · 6 answers · asked by Anonymous in Education & Reference ➔ Homework Help
7(3x+4)=8(2x+5)+13
21x + 28 = 16x + 40 +13
21x -16x = 53-28
5x = 25
x = 5
2006-11-09 11:25:16 · answer #1 · answered by John 4 · 0⤊ 2⤋
Distribute each side (multiply the 7 by 3x and 4 and the 8 by 2x and 5) so that it reads:
21x + 28 = 16x + 40 + 13
21x + 28 = 16x + 53
5x = 25
x = 5
2006-11-09 11:23:35 · answer #2 · answered by Koko T 2 · 3⤊ 3⤋
You first do 7times3x and that is = 21x. Then you do 7times4 and that's= 28. so it should look like this so far
21x+28 = 8(2x+5)+13. Next you do the same thing 8 times 2x is = 16x. Then 8 times 5 is = 40. Now it should look like this
21x+28=16x+40. Now you subtract 16x from 21x and that is =15x
now it should look like this 15x+28=40 then you subtract 28 from 40 and that =12. Now it should look like 15x=12+13 now you divide 15/15=x then 12/15=.8 so now that's your answer x=5. Hope That Helps!!!!!!!
2006-11-09 11:47:47 · answer #3 · answered by Anonymous · 0⤊ 2⤋
first multiply out the stuff
7 x 3X is 21X and 7 x 4 is 28
8 x 2X is 16X and 8x 5 is 40
so,
21X + 28 = 16X = 40 +13
move stuff to same sides
5X = 25
so, X= 5
2006-11-09 11:26:45 · answer #4 · answered by ignoramus 7 · 0⤊ 2⤋
21X + 28=16X+53 then simplfy
2006-11-09 11:22:46 · answer #5 · answered by hy_tone 2 · 0⤊ 2⤋
use the distributive property
i would do the whole thing but i don't think it makes sence cus the others did it
2006-11-09 11:32:38 · answer #6 · answered by Anonymous · 0⤊ 2⤋