If 2x + 2y = 20

Question

&
5x - 3y = 15
Solve using the substitution method.

Answer 1

from eq #1, you know y = 10-x
substitute that into eq #2 and you have

5x-3(10-x) = 15

Now you can find x, and then y.

Answer 2

x=5.625 y=4.375

I have been reworking this problem since last night, even using y=10-x, and was still coming up with incorrect answers. Thank you!