Question

What is the value X?

If 5x + 4y = 23, AND 3x - y = 7

Answer 1

x=3

Explanation:

We can set up a system of equations:

5x+4y=23

3x-y=7

We can isolate y in the second equation:

-y=7-3x

y=3x-7

Then we can solve using substitution:

5x+4(3x-7)=23

Distribute

5x+12x-28=23

17x=51

Divide both sides by 17

x=3