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Question
Solve the following equation by the trial-and-error method: y + 9 = 13
Solution
y + 9 = 13
We try several values of y until we get the L.H.S. equal to the R.H.S.
| y | L.H.S. | R.H.S. | Is LHS =RHS ? |
| 1 | 1 + 9 = 10 | 13 | No |
| 2 | 2 + 9 = 11 | 13 | No |
| 3 | 3 + 9 = 12 | 13 | No |
| 4 | 4 + 9 = 13 | 13 | Yes |
∴ y = 4
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