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Unit 8 Test
Notes for studing, unit 8 test!
13
Mathematics
8th Grade
10/16/2009

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Cards

Term
Has a slope of -3 and passes through (2,1)
Definition
y = mx+b
1 = -3(2)+b
1 = -6+b
+6 +6
7 = b
y = -3x+7
Term
Passes through (2,0) and is parallel to 5x-2y = 7.
Definition
5x-2y = 7
(-2y = -5x+7)/-2
y=5/2x-7/2
m=5/2

y=mx+b
0=5/2(2)+b
0=5+b
-5 -5
-5=b
y=5/2x-5
Term
What is always true to a line that is perpendicular to another? (What do they both have?)
Definition
They both have to have opposite slopes.
exp. m =-1/2 the line perpendicular to it m =2/1=2
Term
what do all parallel lines always have?
Definition
the same slope.
exp. m = 2/3
the line parallel m = 2/3
Term
Passes through (4,5) and is perpendicular to y = 7
Definition
x = 4
Term
What is a relation?
Definition
a set of ordered pairs.
Term
What is a function?
Definition
a relation in which every x-value corrosponds to one y-value.
Term
What is a domain?
Definition
set of all x-values in a relation. no repeating
Term
What is a range?
Definition
set of all y-values, no repeating.
Term
what is the slope of a horozontal line?
Definition
0
Term
What is the slope to a vertical line?
Definition
undefiened.
Term
What is standard form?
Definition
y = mx+b
Term
other than using standard form how can you find the slope?
Definition
(x1, y1) (x2, y2)
m = y1-y2/x1-x2
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