Answer: x=0, y=56
Explanation:
If both triangles are proportional, plug in the equations.
As you can see, you have two equations to work with.
10x+y=56
3x+6=9
get rid of x as a variable first by multiplication.
30x+3y=168
30x+60=90
3y=168
168/3=56
y=56
Now solve for x.
10x+(56)=56
10x=0
x=0