The equation of the line is required.
The proportional relation of the graph is [tex]y=\dfrac{1}{7}x[/tex]
Equation of line
Two points of the line are
[tex](0,0)[/tex] and [tex](21,3)[/tex]
[tex]x_1=0[/tex]
[tex]y_1=0[/tex]
[tex]x_2=21[/tex]
[tex]y_2=3[/tex]
The equation of the line is
[tex]y-y_1=\dfrac{y_2-y_1}{x_2-x_1}(x-x_1)[/tex]
[tex]\Rightarrow y-0=\dfrac{3-0}{21-0}(x-0)[/tex]
[tex]\Rightarrow y=\dfrac{1}{7}x[/tex]
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