Question

What is the answer to
-5 +2y = 9
y = 7x ?

Answer 1

x = 1

y = 7

Explanation:

Two equations, two unknowns. We know that y = 7x so we can substitute that into the first equation to get:

`-5+2\left(7x\right)=9`

`-5+14x=9`

`14x=14`

This gives us x = 1.

Now plug this bag into either equation to find y, I will use the second since it's easier:

y = 7(1) = 7