Question 1076983
I will not work out the math for you.



You have the following:



x^2+y^2 = 100 y = 3/4x


Replace y in the equation with 3/4x. 



x^2 + (3/4x)^2 = 100


x^2 + 9/16x^2 = 100


Take it from there. 


Hint: The graph is a parabola opening upward.