Question 778475
Complementary angles add up to 90°.


x = the angle
90 - x = its complement


90 - x = 5x - 210 {the complement is equal to 210 less than five times the angle}
90 = 6x - 210 {added x to each side}
300 = 6x {added 210 to each side}
x = 50 {divided each side by 6}
90 - x = 40 {substituted 90, in for x, into 90 - x}


the angle is 50°
the complement is 40°
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