For 9x + 25 = 88,
Deena wrote the situation “I bought some
shirts at the store for $9 each and received
a $25 discount. My total bill was $88. How
many shirts did I buy?”
Re-arrange to get x all by itself (as x is the number of shirts).
so first get the 25 off the left hand side (by subtracting it off both sides to balance the equation)
9x + 25 - 25 = 88 - 25
simplify
9x = 53
Then divide both sides by 9 : )
To solve the equation 9x + 25 = 88, where x represents the number of shirts Deena bought, you need to isolate the variable x.
Step 1: Start by subtracting 25 from both sides of the equation:
9x + 25 - 25 = 88 - 25
This simplifies to:
9x = 63
Step 2: Divide both sides of the equation by 9 to isolate x:
(9x) / 9 = 63 / 9
This simplifies to:
x = 7
Therefore, Deena bought 7 shirts.