Question

When the Senior class decided to order T-shirts, they were quoted a price of $7.50 per shirt plus a setup fee. The total cost for 300 shirts was $2,450. Write an equation in the form y = mx + b that represents the cost, y, for x shirts.

Answer 1

Here
m=7.50 / shirt
b=set-up fee
Since we know that
2450=7.5(300)+b
=>
b=2450-7.50*300
=2450-2250
=200

So
y=7.50x+200

Answer 2

Write an equation in the form y = mx + b for the line that passes through the point(-5, -1) and has a slope of -2.