Slope-intercept applications (y = mx + b)
1. a music app charges $2 to download the app plus $1.29 per song downloaded. write and solve a
linear equation to find the total cost to download 30 songs.

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.