Question

Briyana has $150, and she needs to save at least $560 for a spring break trip. if she can save $45 per week, how long will it take her to save enough money?

Answer 1

Answer is 9.11 weeks
( or rounded up to 10 weeks depending on the instructions. 9 will be short of her goal, 10 will be over her goal)

Step by step

We can use y intercept to find this

y = mx + b

We know y = $560 needed

We know the rate (m) is $45 per week

We know her starting point (b) is $150

$560 = $45x + $150

Subtract 150 from both sides to isolate variable x

$560 - 150 = $45x + 150 - 150

$410 = $45x

Now divide both sides by 45 to solve for x

$410/45 = 45/45 x

X = 9.11 weeks