Homework Help: 7th grade math

Posted by saranghae12 on Monday, April 9, 2012 at 10:08pm.

How would you solve the problem below using the subsitution method?

12x + 4 = 8y
y = x - 7

Please explain to me and help. If you could show all the steps, that would help a lot. Thank you.

7th grade math - bobpursley, Monday, April 9, 2012 at 10:27pm
put the y equation in the first equation.

12x+4=8*(x-7)
12x+4=8x-56

subtract 8x from each side, subtract 4 from each side.

Then having solved for x, put that into the original y= equation
7th grade math - saranghae12, Monday, April 9, 2012 at 10:36pm
Oohhh thank you soo much!!!

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