Could you please help me with this question : explaining your step-by-step approach to solving the problem below

Question

You are moving and need a rental truck. The rental company you have chosen charges a $70/day fee plus $0.20 for every mile you travel. Write a linear equation that expresses the total cost y, where x represents the number of miles you travel. Graph this equation. Then choose a number of miles, x, you travel that day and find the total cost of renting the truck.

Answer 1

The equation you want is y = 20+.2x

Since it is a linear equation, its graph will be a straight line with slope .2 and y intercept 20.