The slope is
[ (y-value of 'b') - (y-value of 'a') ] / [ (x-value of 'b') - (x-value of 'a') ]
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y=mx+b
Y=mx+b
6
if line's A and B are perpendicular to each other, the slope of A = -1/(the slope of B)
y= mx + b where m is the slope and b is the y-intercept if by "points" you mean (1,-2)... a slope of -4 means that for every change of 4 in the x direction, there is only a change of 1 in the y direction the line will cross the y axis at -2.25 (there will be a another point a (-3, -3) y = -4x + -2.25