19x + 40 and x are supplementary angles. Determine the measure of each angle.
Supplementary angles add up to 180°.
x + 19x + 40 = 180 {added the two angles and set equal to 180°} 20x + 40 = 180 {combined like terms} 20x = 140 {subtracted 40 from each side} x = 7 {divided each side by 20} 19x + 40 = 173 {substituted 7, in for x, into 19x + 40} The two angles are 7° and 173° Ask Algebra House
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