Young solves the equation - 2z - 7 = - 19 and gets z = 6 .

Question

Which answer best shows how he checked his answer?
Step 1: -2(6) - 7

Step 2: -12 - 7

Step 3: -19



Step 1: -2(6) - 7 Step 2: -12 - 7 Step 3: -19

Step 1: -2(6) - 7

Step 2: 4 - 7

Step 3: -4



Step 1: -2(6) - 7 Step 2: 4 - 7 Step 3: -4

Step 1: -2(6) - 7

Step 2: -12 - 7

Step 3: -5



Step 1: -2(6) - 7 Step 2: -12 - 7 Step 3: -5

Step 1: -2(6)-7

Step 2: 12 - 7

Step 3: 5

Answer 1

Step 1: -2(6) - 7
Step 2: -12 - 7
Step 3: -19

The correct answer is the first one. Young checked his answer by plugging z = 6 back into the original equation and solving it step by step to verify that it equals -19.