Answer:
The equation can be used 45 + x = 315
Step-by-step explanation:
Devon has $45 in his savings account.
Devon wants to have $315 in his savings account.
The equation can be used to determine how much money Devon needs to save in order to have $315.
Let the amount he needs = x
45 + x = 315
x = 315 - 45
x = $270
Devon needs $270.