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slope of line
= y2y1 / x2 x1

linear equation
y = m (slope) x + b (y intercept)


horizontal lines have a slope of
0

vertical lines
have an undefined slope

lines are perpendicular is the product of their _____ equals _____
product of thier slope equals 1.

midpoint formula
x1 +x2/2, y1+y2/2

parabolas
y=ax ^{2} + bx + c
 a=slope
 b= position relative to yaxis
 x= y intercept

the a term or a parabolas
 a positive a term indicated the parabola opens up
 a negative term indicated the parabola opens down

the y intercept of a parabola
 from a grapth you can see it,
 from and equation you can identify the c term.

the x intercepts
 from a graph you can spot them
 from an equation you set the equation equal to zero and solve for x.

the b term
create a small chart of corresponding x and y values ... the effect of b term will be apparent from the shift of the parabola, since an equation without a b term is always symeetrical about the y axis.

equations in the form x=ay^{2 + by +c = horizontal parabola. }

