Question

Ms. Ponse is saving for a new iPhone. She has $150 saved and will be saving $50 per month. If the phone costs $799, how many months will it take her to save enough money?

Answer 1

It would take Ms. Ponse 13 months to save up for the phone.

Explanation:

If Ms. Ponse already has $150, then that would be the y-intercept (b) in the equation.

So, our equation so far is y = mx + 150

And since Ms. Ponse saves $50 per month, that would be the slope (m).

Now our equation would be y = 50x + 150

And we need to make our y equal to $799, since that's the goal for how much we need Ms. Ponse to save up.

799 = 50x + 150

We now need to solve for x.

x = # of months

799 = 50x + 150

- 150 - 150

799 - 150 = 50x

/50 /50

12.98 = x

And it's safe to assume that 12.98 isn't actually a number of a month, so we have to round up, meaning that it will take Ms. Ponse 13 months to buy the new iPhone.

Answer 2

it’ll take her 13 months