A line passes through the points (4,15) and (9,20). Right in line your function rule in terms of x and y for this line

Just tell me how to set up the equation.

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?