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Y equals 5 minus 2 X

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1 Answer

Hi again Ge Manni;
y=5-2x
I prefer to write this as...
y=-2x+5
This is in the format of...
y=mx+b
m is the slope.  The slope is defined as the change-of-y divided by the change-of-x, also known as rise-over-run.  The slope of this line is -2, -2/1.  The protocol of mathematics requires that the negative sign is in the numerator.  However, the field of mathematics is contradicting itself.  The way a negative line functions is with the negative activity occurring in the denominator, 2/-1.  This line rises positively on the y-axis two units, as it moves to the left, the negative direction of the x-axis, one unit.
 
b is the y-intercept.  This is the value of y when x=0.  One coordinate of this line is (0,5).  This line passes through the y-axis at the point of 5 on the y-axis.