If the point (4,5) lies on the graph of the equation 5y = ax+9, find the value of a. [3 MARKS]

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Solution

The correct option is B
4

Explanation : 1 Mark
Calculation : 1 Mark
Result : 1 Mark

If the point (4, 5) lies on the line 5y=ax+9, it must satisfy the equation 5y=ax+9
Therefore, 5x5 = ax4 +9,
Or, 25 - 9 = 4a
Or, 4a = 16
Or, a =4

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