Question

A tiling company completes two jobs. The first job has $1200 in labor expenses for 40 hours worked, while the second job has $1560 in labor expenses for 52 hours worked. The relationship between the labor expenses and the hours worked is linear. Which equation can be used to calculate the y-intercept of the linear equation?
1200 = 40 (40) + b
1560 = 30 (40) + b
1560 = 30 (52) + b
1200 = 52 (30) + b

Answer 1

Slope m = (1560 − 1200)/(52 − 40) = 360/12 = 30.
Use one point in y = mx + b, e.g. (52,1560): 1560 = 30(52) + b.