# coordinate geometry

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1. slope of line
= y2-y1 / x2- x1
2. linear equation
y = m (slope) x + b (y intercept)
3. x intercept=
-b/m
4. horizontal lines have a slope of
0
5. vertical lines
have an undefined slope
6. lines are perpendicular is the product of their _____ equals _____
product of thier slope equals -1.
7. midpoint formula
x1 +x2/2, y1+y2/2
8. parabolas
y=ax2 + bx + c

• a=slope
• b= position relative to y-axis
• x= y intercept
9. the a term or a parabolas
• a positive a term indicated the parabola opens up
• a negative term indicated the parabola opens down
10. the y intercept of a parabola
• from a grapth you can see it,
• from and equation you can identify the c term.
11. the x intercepts
• from a graph you can spot them
• from an equation you set the equation equal to zero and solve for x.
12. 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.
13. equations in the form x=ay2 + by +c = horizontal parabola.

## Card Set Information

 Author: kaytea1112 ID: 28715 Filename: coordinate geometry Updated: 2010-08-02 13:44:02 Tags: gre math geometry coorinate Folders: Description: more notes m Show Answers:

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