Activity (Process)

Solving a Problem Where the Larger Supplementary Angle is 18 Degrees Less Than Twice the Smaller

To calculate the measures of two supplementary angles when the larger is 1818 degrees less than twice the smaller, frame the problem as a system of equations suitable for substitution. Use xx for the smaller angle and yy for the larger. The supplementary relation yields x+y=180x + y = 180. The comparative phrase translates to y=2x18y = 2x - 18. Substituting yy into the first equation results in x+(2x18)=180x + (2x - 18) = 180. Combine like terms to form 3x18=1803x - 18 = 180, add 1818 to obtain 3x=1983x = 198, and divide by 33 to find x=66x = 66. Replace xx in the second equation: y=2(66)18=13218=114y = 2(66) - 18 = 132 - 18 = 114. The angle measures are 6666^{\circ} and 114114^{\circ}.

0

1

Updated 2026-04-24

Contributors are:

Who are from:

Tags

OpenStax

Intermediate Algebra @ OpenStax

Ch.4 Systems of Linear Equations - Intermediate Algebra @ OpenStax

Algebra

Related