Answer:
Battery cost = 5
Step-by-step explanation:
Set it up algebraically:
x + 10 = 15
*One step equation: an algebraic equation you can solve in only one step. Once you've solved it, you've found the value of the variable that makes the equation true. To solve one-step equations, we do the inverse (opposite) of whatever operation is being performed on the variable, so we get the variable by itself. (I knew what it meant, I just needed a website to help me explain it lol)
x + 10 = 15
- 10 - 10
x = 5
