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standard form of a linear equation

Ax+By=C

Slope formula

Y2-Y1 divided by X2-X1

Midpoint formula

(X2+X1divided by 2, Y2+Y1 divided by 2)

Distance Formula

The Square root of (X2-X1)squared + (Y2-Y1)squared

Direct Variation

Y=KX

slope-intercept form

Y=MX+B

point-slope form

Y-Y1= M( X-X1)

parallel lines

slope is the same.

perpendicular lines

opposite of the reciprocal

vertical lines

X= a number

horizantal lines

Y= a number