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Question
Solve the following equation by the trial-and-error method: 3y = 36
Solution
3y = 36
We try several values of x until we get the L.H.S. equal to the R.H.S.
| y | L.H.S. | R.H.S. | Is L.H.S. = R.H.S.? |
| 6 | 3 × 6 = 18 | 36 | No |
| 7 | 3 × 7 = 21 | 36 | No |
| 8 | 3 × 8 = 24 | 36 | No |
| 9 | 3 × 9 = 27 | 36 | No |
| 10 | 3 × 10 = 30 | 36 | No |
| 11 | 3 ×11 = 33 | 36 | No |
| 12 | 3 × 12 = 36 | 36 | Yes |
∴ y = 12
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