Use mental math to guess the starting value for the table.
H
Practice makes perfect
We want to use a table to solve the given equation.
7d+7=14
In order to choose a good starting point for our table, let's pretend that the equation is 7d=14. What multiplied by 7 would get us close to 14? The answer is 2, so let's try it in our table. We should also try substituting surrounding numbers, in this case 3 and 1, just to be on the safe side.
d
7d+7
=
2
7( 2)+7
21
3
7( 3)+7
28
1
7( 1)+7
14
The solution is d=1, which corresponds to option H.
