Question

To draw the graph of x + 2y = 4, find x when y = 1: 

Options

• 1

• 2

• −2

• 6

Answer 1

2

Explanation:

Given equation, x + 2y = 4

When y = 1

∴ x + 2(1) = 4

∴ x + 2 = 4

∴ x = 4 − 2

∴ x = 2

∴ To draw the graph of x + 2y = 4, when y = 1, the value of x is 2.