Question

3. Draw the graph of y = 4x − 1 using a scale of 2cm to 1 unit on x-axis and 2cm to 5 units on y-axis. (a) Use the graph to find the value of x when y = 18.

Accepted Answer

Table: x = −1, 0, 1, 2, 3, 4, 5 gives y = −5, −1, 3, 7, 11, 15, 19.
Plot the points and join with a straight line (see graph in the Diagram column).
From y = 18 on the y-axis, go across to the line, then down to the x-axis: x = 4.75.
Check: 4x − 1 = 18, x = 19/4 = 4.75.

JSCE Mathematics 2023 Theory — Question 9

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