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Question
Plot a line graph for the variables x and y , where y = 2x + 1.
Using the graph, find the value of (i) y, when x = 5 and (ii) x, when y = 13.
Using the graph, find the value of (i) y, when x = 5 and (ii) x, when y = 13.
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Solution
We have the following table for y = 2x+1
x 0 1 2 3 4 y 1 3 5 7 9
(i) Thus, looking at the graph, when x= 5 , y = 11
(ii) Thus, looking at the graph, when y = 13, x = 6
We have the following table for y = 2x+1
| x | 0 | 1 | 2 | 3 | 4 |
| y | 1 | 3 | 5 | 7 | 9 |
(i) Thus, looking at the graph, when x= 5 , y = 11
(ii) Thus, looking at the graph, when y = 13, x = 6
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