Answer:
It would take Ms. Ponse 13 months to save up for the phone.
Step-by-step 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.
