8. An Introduction to Equations
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Use mental math to guess the starting value for the table.
4
5x+3=23 In order to choose a good starting point for our table, let's pretend that the equation is 5x=23. What multiplied by 5 would get us close to 23? 4 or 5 would be equally valid, so let's try those in our table. We should also try one digit less and one digit greater, just to be on the safe side.
x | 5x+3 | = |
---|---|---|
3 | 5 (3)+3 | 18 |
4 | 5 (4)+3 | 23 |
5 | 5 (5)+3 | 28 |
6 | 5 (6)+3 | 33 |
We can see that x=4 is the solution to our equation.