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what is the equation for the gradient?
y2-y1/x2-x1
what is a way to write the equation of a straight line?
ax+by+c=0
how do you write a line equation with m and (x1,y1)
(y-y1)=m(x-x1)
how do you find the distance between 2 points
square root of (x2-x1)²+(y2-y1)²
how do you find the gradient of a perpendicular line?
-1/m