ab^2x
\<span>ab^2x/ab^2y = --------------- = x/y. the ab^2 factor cancels from numerator
ab^2y and denominator.
</span>
The pyhtagorean states that to find c, use the eqaution,

.
Substitute 1 for a and 20 for b;
c^2=1+400
c^2=401
c=
which is about 20.02
Hope this helps.
Answer:
The answer is x=4
1.Move 7 to the other side (which makes it become a negative)
2.solve 19 -7=12
3.12 divided by 3=4
x=4