Answer:
21 weeks
Explanation:
Equation: y = 15x + 35
15 is the rate of change and 35 is the starting point
Lets replace y with 350 since that the goal
350 = 15x + 35
Subtract 35 from both sides;
315 = 15x
Divide both sides by 15;
x = 21
He will have to deliver papers for 21 weeks to have enough money to buy a new bicycle.