Solve the system of linear equations by substitution. 7x + 2y = 36

−6x + 3y = 21

The solution to the system is ( , )

I'm terrible at math any here is appreciated.

What is the slope of a line that is perpendicular to y = 3x + 1

Carmen begins her next painting on a rectangular canvas that is 82.7 cm long and has a area of 8,137.68 cm2. will the painting fit in a frame with an opening that is 82.7 cm long and 95 cm wide? explain