How do you graph #y=4x-1# by plotting points?
For a strait line graph you technically only need two points. It is better to have 3 or more. I would suggest 3. The logic behind this is that if all the points do not line up when you draw a line through them then you have a wrong calculation some ware.
You may chose to determine what is called critical points and use those (just 2) or you may chose substituting values for
Calculation Point 1
Calculation Point 2
You always read left to right on the x-axis. Sometimes the reverse order is given in questions setting 'a trap'.
ALWAYS READ LEFT TO RIGHT ON THE X-AXIS FOR WHEN Y IS THE ANSWER
You either need a given point or the equation.
The x-axis crosses the y-axis at
The y-axis crosses the x-axis at
Set #x=0" : " y=4x-1" "->" "y=4(0)-1 " "->" "y=-1
So we now have the point:
So we now have a second point: