Plot a line graph for the variables p and q, where p is four times q, i.e., the equation is p = 4q.
Using the graph, find the value of (i) p, when q = 6 and (ii) q, when p = 20.

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Solution

We have p = 4q
(i) When q = 6
then p = $4 \times 4 = 16$
(ii) when p = 20
then, 20 = 4q
5 = q

And the graph of p = 4q is given by

q 1 2 3 4 5 6

p 4 8 12 16 20 24

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Plot a line graph for the variables p and q, where p is four times q, i.e., the equation is p = 4q. Using the graph, find the value of (i) p, when q = 6 and (ii) q, when p = 20.

We have p = 4q (i) When q = 6 then p = 4×4=16 (ii) when p = 20 then, 20 = 4q 5 = q And the graph of p = 4q is given by q 1 2 3 4 5 6 p 4 8 12 16 20 24

Plot a line graph for the variables p and q, where p is four times q, i.e., the equation is p = 4q.
Using the graph, find the value of (i) p, when q = 6 and (ii) q, when p = 20.

We have p = 4q
(i) When q = 6
then p = $4 \times 4 = 16$
(ii) when p = 20
then, 20 = 4q
5 = q

And the graph of p = 4q is given by

q 1 2 3 4 5 6

p 4 8 12 16 20 24