## Elementary Algebra

Let x represent the angle. The complement of the angle is 90 - x. The supplement of the angle is 180 - x. We set up this proportion. $\frac{7}{16}$ = $\frac{90-x}{180-x}$ To solve this equation, we equate the cross products. 7 $\times$ (180 - x) = 16 $\times$ (90 - x) 1260 - 7x = 1440 - 16x 16x - 7x = 1440 - 1260 9x = 180 Divide both sides by 9. x = 20 The angle is 20 degrees.