how do i graph as a function p(x)=4x

Question

Graph the linear function

Answer 1

This is a linear function for the form f(x) = ax+b , the function is

p(x) = 4x , b=0 and the y intercept ( 0,b) is the point ( 0,0)

 

Therefore the line passes through the origin. In order to graph a straight line you need a minimum of two points. You already have

one of them the origin (0,0). a second point can be obtained by choosing on the x axis say x =2 and substituting into the equation

p(x)=4x =4(2)=8. the second point is therefore (2,8)

Plot the two points on the graph and join them by a straight line and you get the graph of the line. Also note that you can choose other point say x=1 and p(x)=4(1) =4 and the point is (1,4). Any point you obtain by substituting a value of x to get p(x) is located on the line.

Answer 2

Select three pairs that solve (only two are necessary, yet three ensures accuracy). As an example:

(0, 0)

(2, 8)

(-3, -12)

 

Plot the three point, draw the line through them.