If 2y = 3 − 5x, find the value of y when x = −1.

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Solution

On putting the value of x = -1 in the equation, 2y = 3 - 5x, we get:
2y = 3 - 5 × (-1)
⇒ y = $\frac{1}{2}$ × [3 - 5 × (-1)] = 4
∴ y = 4 when x = -1

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