25^2=7^2 + x^2
49 + x^2 = 625
x^2= 576
square both sides
x=24
Well if you're wanting to use substitution, you first have to end up with one term on either side of the equation. Use the second one as it's easiest.
So: x-2y=11, so find -2y as there is a -2y in the first equation.
then that becomes -2y=11-x. then sub that into equation 1, and you get:
-x+11-x=-13, which equals to -2x+11=-13, which is -2x=-24, so therefore
x=12. then chuck the x into any of the equations to find what y equals.
hope this helps!
Possible values are
x=1,y=11
x=2,y=8
x=3,y=5
x=4,y=2
