Answer:
x=3
Step-by-step 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
