How do you graph 4x+1=9 by plotting points?

1 Answer
Jul 19, 2016

x=2 is a vertical line through (2.0)

Explanation:

Let's start off by simplifying the equation a bit.

4x = 9-1 =8

4x = 8 " "rArr x = 2

x= "any number" is the equation of a vertical line which passes through the x-axis at x =2

You can plot any number of points, but you will find that no matter what y-value is used, the x-value is always 2.

All the points will be (2, y)

Vertical lines cannot be written in standard form y = mx +c.
They have a slope which is undefined.
They do not have a y=term at all.