We know that x= y+3
We can substitute x for y+3
6(y+3)-5y=15 Solve.
Distribute.
6y+18-5y= 15
y+18=15
Subtract -18 on both sides.
y=-3
Now, plug that in.
x= y+3
x= -3+3, x= 0
We can check to see if this works.
0= -3+3
0=0
6(0)-5(-3)= 15
0+15= 15
15=15
So,
y=-3 and x= 0
I hope this helps!
~kaikers