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 y-axis
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. }