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