Plot a line graph for the variables p and q where p is two times q i.e, the equation is p = 2q. Then find.
A) the value of p when q = 3
B) the value of q when p = 8
The given equation is p = 2q.
Here, p is the dependent variable and q is the independent variable.
So, p will be on the y-axis and q on the x-axis.
When q = 0,
p = 2 (0) = 0
When q = 
,
p = 2 
= 1
When q = 1,
p = 2 (1) = 2
When q = 2,
p = 2 (2) = 4
The points in the graph are
A = (0, 0)
B = (
, 1)
C = (1, 2)
D = (2, 4)
The line segments are
A) When q = 3,
p = 6 (from the graph)
B) When p = 8,
p = 4 (from the graph)
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