Question

I need help with substitution. please

4x-3y= 38
5x+y=38
A)y=-2
B)y=-8
C)y=2
D)y=3

Answer 1

Are you asking how to solve this pair of equations for the (x,y) that "works" for both, using substitution?

if so, can you solve for y, using the 2nd equation:
5x+y=38

Answer 2

No, I don't think so..? I just had to pick which letter (a,b,c, or d) works for it..?

Answer 3

x=8 y=-2 answers http://mathway.com/answer.aspx?p=calg?p=4x-3ySMB01SMB1538_5x+ySMB0138?p=167?p=?p=?p=?p=?p=0?p=?p=0?p=?p=?p=SolveSMB15bySMB15SubstitutionSMB15Method

Answer 4

If you want to learn how to solve equations, this (and the other) videos will help
http://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/v/adding-and-subtracting-the-same-thing-from-both-sides