Question

Select the correct answer. Camille is saving for a laptop that costs about $850. To model her savings plan and determine how many more months it will take her to reach her goal, she recently created this equation, where y represents the total amount saved and x represents the number of months. Which statement about her work is true?' Step Calculation Step 1: y = 80 + 70x Step 2: y − 80 = 80 + 70x − 80 Step 3: y − 80 = 70x Step 4: = Step 5: = x Step 6: = x Step 7: 11 = x A. Camille used the associative property in step 3. B. Camille used the multiplication property of equality in step 4. C. Camille used the subtraction property of equality in step 5. D. Camille used the substitution property in step 6.

Answer 1

C. Camille used the subtraction property of equality in step 5.

Explanation:

In step 2, Camille subtracted 80 from both sides of the equation. In step 3, she simplified the equation by combining like terms. In step 4, Camille divided both sides of the equation by 70 to isolate the variable x. In step 5, she subtracted y-80 from both sides of the equation to isolate x. In step 6, Camille simplified the equation by dividing both sides by -1/70. Finally, in step 7, she calculated the value of x.

Therefore, option C is the correct answer.