What is the system of equations 6x-6y=42 7x+6y=-78

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

Write the standard form of an equation with (see picture below)

What is the value of x in this triangle? a. 53° b. 62° c. 65° d. 118°