Please help solve for X

Sadie computes the perimeter of a rectangle by adding the length, l, and width, w, and doubling this sum. eric computes the perimeter of a rectangle by doubling the length, l, doubling the width, w, and adding the doubled amounts. write an equation for sadie’s way of calculating the

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?