Question

Justin wrote the following indirect proof:

Prove: 7 is a factor of 91.

Step 1: Assume that 7 is a factor of 91.
Step 2: 91 divided by 7 is 13.
Step 3: A factor is an integer by which another integer is divisible.
Step 4: Therefore, 7 must be a factor of 91.

Which step in Justin's proof is incorrect?

Step 1

Step 2

Step 3

Step 4

Answer 1

Is this geometry?

Answer 2

step 1

Answer 3

since its indirect you should assume

Answer 4

yes THANK YOU

Answer 5

:)