Determine the point on the graph of the equation 2x + 5y = 21 whose x-coordinate is the same as y-coordinate. [3 MARKS]
Concept : 1 Mark
Calculation : 1 Mark
Result : 1 Mark
Given, X=Y
Let the required point be (a, a)
Since this point is on the line, it should satisfy the equation of the line.
2a + 5a = 21
7a = 21
a = 3
The required point is (3, 3)