Pls help ASAP!!
On a recent exam, a student was asked to simplify the expression:
13(5x − 3y) − 3(10y + 6x)
Their work is shown below:
Step 1: 13(5x − 3y) − 3(10y + 6x)
Step 2: 65x − 39y − 30y − 18x
Step 3: 65x + 18x − 39y − 30y
Step 4: (65x + 18x) + (−39y − 30y)
Step 5: 83x − 69y
Part A: In which step did they make a mistake, and what was it? (2 points)
Part B: How would you correct the mistake and solve the problem? Show all of your work. (2 points)
