Question 562121
Just by adding 2x to both sides of that first equation we get
y=3+2x

now we can plug in 3+2x in for y

3x-2(3+2x)=5
3x-6-4x=5
-x-6=5
-x=11
x=-11

plug in -11 for x

y-2(-11)=3
y+22=3
y=-19