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Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

Answer for 10 points show work you guys in advanced < 3

What is solution for the following system of equations, 2x+8y=4 and x=-3y+5 1) x=14 y=-3 2) x=2 y=-3 3) x=-3 y=-3 4)x=12 y=5