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Graph the following equation

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4 Answers

This equation  (y = -4x + 1) is in the form (y = mx + b), where m is the slope and b is the point where the line crosses the y-axis.
 
The slope (m) is a value that tells us how fast the line increases or decreases.  Since this equation has a value for m = -4, it is decreasing (the negative value).  We commonly call this rise over the run. 
 
The y-intercept value (b) = +1.

Hence the plot is :  (apologies for not being able to do graphics here !) contact me and I'll send you an email with a more detailed plot.
 
        Y
 
        |
     \  |
      \ |
       \|
        \   +1
        |\
        | \
------+--\--------------------------------   X
        |    \
        |     \
        |      \
        |       \
 
 
 
 
 
 
 
 
 
 
The equation y= -4x + 1 is in the "slope-intercept" form of y=mx+b, where m is the slope (rise over run), and b is the y-intercept (where the line will cross the vertical y-axis).
 
You need graph paper for an accurate graph (but it's possible to do it on notebook paper).
 
It's best to start at the y-intercept and plot your first point there. Put a dot on the y-axis 1 unit up from the origin.
 
I like to rewrite the slope as a fraction, to better visualize the "rise over run" so -4 becomes -4/1. This means I rise negative 4 (fall 4) and run to the right 1.
 
So, starting at the dot you made at the y-intercept, count down 4 units, then right 1 unit, and draw your second dot. You can repeat the process starting there for more points: count down 4, then right 1.
 
Lastly, you can go back to the y-intercept and count in the opposite direction, since your slope is also equal to positive 4 over negative 1. You can then count UP 4 units, and LEFT 1 unit.
y=-4x+1 is in the form y=mx+b where m is the slope and b is the y-intercept
the slope is -4 or (-4/1) or (4/-1) and the line crosses the y-axis at 1
 
plot the point (0,1)
from this point move 4 units down and 1 unit to the right to come to the point (1,-3), now plot this point
from the point (0,1) move 4 units up and 1 unit to the left to come to the point (-1,5), now plot this point
the slope is defined as the rise over the run (rise/run)
rise means up or down on the y-axis and run means left or right on the x-axis
you have three points: (0,1), (1.-3), and (-1,5); connect these points with a ruler and you have the graph
 
Hi Theresa;
I am assuming that you know how to graph.  If not, please let me know.
What you are going to do is calculate the value of y for a list of values of x.
It would be most logical to do this...
 
 x| y
-2|
-1|
 0|
 1|
 2|
 
y=-4x+1
y=-4(-2)+1=8+1=9
 
y=-4x+1
y=-4(-1)+1=4+1=5
 
y=-4(0)+1=1
 
y=-4x+1
y=-4(1)+1=-4+1=-3
 
y=-4(2)+1=-8+1=-7
 
x | y
-2|9
-1|5
 0|1
 1|-3
 2|-7