4. Mike is a veterinarian. He is placing an nine-line job ad for an assistant. The following piecewise function gives the price of an x-line
ad.
a(x) = {45
when x < 3}
{45 + 9(x-3) when x > 3}
a. Find the difference between the cost of a two-line ad and the cost
of a 3-line ad.
b. Find the cost a 10-line ad
I
c. Find the cost of the 10-line ad.

Arrange the steps to solve this system of linear equations in the correct sequence. x + y = -2 2x – 3y = -9 tiles subtract 3x + 3y = -6 (obtained in step 1) from 2x – 3y = -9 (given) to solve for x. substitute the value of x in the first equation (x + y = -2) to get y = 1. the solution for the system of equations is (-3, 1). x = -15 the solution for the system of equations is (-15, 13). add 3x + 3y = -6 (obtained in step 1) to 2x – 3y = -9 (given), and solve for x. x = -3 substitute the value of x in the first equation (x + y = -2) to get y = 13. multiply the first equation by 3: 3(x + y) = 3(-2) 3x + 3y = -6.