The sum of a triangle's interior angles is 180∘. From the figure, we can see that one of the angles is a right angle. The remaining two are x and y. By adding these together, we can equate their sum with 180.x+y+90=180
Using the equation found in part A and the given equation, we can form a system of equations.
Let's solve it using the Substitution Method. To do so, we will start by isolating the x-variable in Equation (I).
Let's now substitute 90−y for x in Equation (II) and solve the resulting equation for y.