Supplementary angles are two angles that have measures with a sum of 180 degrees. Angles 1 and 2 are supplementary and the measure of angle 2 is 3 degrees more than twice the measure of angle 1. Write a system of equations and use substitution to find the measures of angles 1 and 2.

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.