8th Grade Math

Vocabulary

100

In y=kx, k is what we call ______

constant of proportionality

200

the point where two lines meet is called the _____

intersection

300

Slope is best calculated as ______

rise over run

400

In the Pythagorean Theorem, a-squared plus b-squared equals ______

c-squared

500

the longest side of a right triangle is called the ____

hypotenuse

Elimination

100

x+3y=4

3x-3y=12

(4,0)

200

6x+3y=9

-x+3y=9

(0,3)

300

2x+3y=12

4x-3y=6

(3,2)

400

4x+3y=22

2x-3y=2

(4,2)

500

7x-4y=1

3x+4y=29

(3,5)

Substitution

100

y=2x

3x+y=15

(3,6)

200

y=x+1

2x+y=10

(3,4)

300

x=4y

2x-3y=7

(5.6,1.4)

400

x=y-2

2x+3y=16

(2,4)

500

y=5x-7

3x+2y=12

(2,3)

Number of Solutions

100

y=2x+3

y=2x+3

infinitely many

200

y=-x+2

y=x+2

1 solution

300

y=3x-1

3x-y=5

No solution

400

2x+3y=6

4x+6y=12

infinitely many

500

3x-y=7

6x-2y=10

No solution

Find the Slope

100

(1,2) and (3,6)

2

200

(4,5) and (7,11)

2

300

(-2,3) and (2,-1)

-1

400

(5,10) and (5,-2)

no slope

500

(-3,-2) and (3,4)

1