
Confused
I need help with a problem.
I worked it out but I think I'm wrong. Can some one please help solve this correctly?
Use substitution to solve: 2x + y = 7
5x  2y = 4
My answer:
y = 7  2x
7x  (72x) = 11
7x  7 + 2x = 11
2 7
9x 18
9x/9 = 18/9
y=2
5x  2y = 4
5x2(2)=4
this is where I'm lost.
Can someone help me.

you were doing fine until
"...9x/9 = 18/9
y=2"
You were solving for x and then you said y = 2?
Should it not be x = 2?

Ok thank you.
so that is x = 2
then:
5x  2y = 4
5(2)  2y = 4
10  2y = 4
2y = 14
y = 7

No.
y = 3.
Why is
2y = 14 ?
5x  2y = 4
5(2)  2y = 4
10  2y = 4
2y = 4 10
2y = 6
y = 6 / 2
y = 3

O.i.c where I made my mistake. THank you for the help.