How do I use substitution to solve the system? Please help Addition and equal key is not working

Question

-5x plus 2y equal 16
y equal 2x plus 7

Answer 1

-5x+2y=16

y = 2x+7

Tika,
Doesn't the 2nd equation tell you what the value of y is ??
Just replace the y in the 2y of the first equation with the value of y in the second.
Give it a try, it is really easy.
Let me know what you got.

Answer 2

I'm still lost

Answer 3

first equation:
-5x + 2y = 16
subbing in y = 2x+7
----> -5x + 2(2x+7) = 16
-5x + 4x + 14 = 16
-x = 2
x = -2

now put that back into
y = 2x+7
= 2(-2) + 7 = 3

all done

curious, at what grade level are you taking this?

Answer 4

Your question seems a bit sarcastic, but thank you for showing me step by step on how you got the answer. This is college level algebra, and I have always had trouble with algebra. I haven't taken a math course in over 16 years.

Answer 5

Was not meant to be scarcastic, simply trying to figure out the best way to explain it, there are several ways.

Answer 6

The question is asking x equals and y equals