4. Calcular la medida del ángulo A de un triángulo ABC tal que: a’(b-c)=b - c a. 30°
d. 120°
b. 60°
e. 150
C. 90°

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.

Which statements about the system are true? check all that apply. y =1/3 x – 4 3y – x = –7 the system has one solution. the system consists of parallel lines. both lines have the same slope. both lines have the same y–intercept. the equations represent the same line. the lines intersect.