Solve each system by the equation: 1.-x-5y=-19
y=-6x-2

2.3x+7y=24
y=6

3.-x-6y=-2
y=4x+17

4.-5x+y=-2
-4x+6y=-12

5.2x+y=8
4x-y=-8

6.-6x+4y=2
x+y=-7

Addison painted her room. she had 5 0 5050 square meters to paint, and she painted at a constant rate. after 2 22 hours of painting, she had 3 5 3535 square meters left. let a t a(t)a, left parenthesis, t, right parenthesis denote the area to paint a aa (measured in square meters) as a function of time t tt (measured in hours). write the function's formula.