The equation is:
[tex]y=21x[/tex]
To graph that equation, as it is a equation for a line, you need to find the coordinates (x,y) for two points on the line.
To find a point on the line you give for one of the variables a value and calculate the value of the other variable with the equation.
If x= 5
[tex]\begin{gathered} y=21(5) \\ y=105 \end{gathered}[/tex]
Then, when x=5 y=105. The first point have coordinates (5, 105)
If y= 0
[tex]\begin{gathered} 0=21x \\ \frac{0}{21}=x \\ x=0 \end{gathered}[/tex]
Then, when y=0 x=0. The second point have coordinates (0, 0)
You put that points in the plane:
Draw a line that passes through taht points:
