Question

I honestly do not know how to do this :(

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the second equation is substituted into the first equation.

2x - 7y = 4
3x + y = -17

Answer 1

So it is asking us to solve for 'y' in that second equation

\[3x + y = -17\]

We want to get 'y' alone on that left side of the equation...so lets subtract 3x from both sides of that equation

\[y = -3x - 17\]

Now you would substitute that into the FIRST equation you have....wherever you see a 'y'...

Answer 2

so the first equation we have is

\[2x - 7y = 4 \]

after substituting in the 'y' we just found we have

\[2x - 7(-3x - 17) = 4\]

Would be the new equation that we get

Answer 3

Hope that is understandable?

Answer 4

YES thank you so much!

Answer 5

No problem!