Question

The graph shows the number of hours that Tammy spends typing for work, x, and the amount of pay that she earns, y.

On a graph titled Tammy's Pay, number of hours is on the x-axis and pay in dollars is on the y-axis. A line goes through points (2, 18) and (8, 42).

What does the y-intercept represent?
Tammy initially had $10 pay.
Tammy will type for 10 minutes each day.
Tammy initially had $4 pay.
Tammy will type for 4 minutes each day.

Answer 1

Find slope: (42−18)/(8−2)=24/6=4, so y = 4x + b. Plug (2,18): 18 = 8 + b → b = 10.
The y-intercept 10 means Tammy has $10 when x = 0, so: "Tammy initially had $10 pay."