Unit 3

x and y intercepts

100

x + y = 5

x int: 5

y int: 5

200

2x + 4y = 4

x int: 2

y int: 1

300

5x + 10y = 20

x int: 4

y int: 2

400

3x + 2y = 36

x int: 12

y int: 18

500

3x + 7y = 42

x int: 14

y int: 6

slope from a graph

100

To get from one point to another on a graph you must go up 3 right 2, what is the slope?

3/2

200

To get from one point to another on a graph you must go up 6 right 3, what is the slope?

2

300

To get from one point to another on a graph you must go down 5 right 4, what is the slope?

-5/4

400

To get from one point to another on a graph you must go down 8 right 2, what is the slope?

-4

500

To get from one point to another on a graph you must go up 0 right 9, what is the slope?

0

slope from 2 points

100

Find the slope between (3,1) & (0,0)

1/3

200

Find the slope between (4,2) & (3,1)

1

300

Find the slope between (7,3) & (4,1)

2/3

400

Find the slope between (-3,4) & (2,-5)

-9/5

500

Find the slope between (-3,-1) & (-8,-3)

2/5

direct variation graphs

100

If the slope of a graph is 3, what is the constant variation?

3

200

If the slope of a graph is 1/2, what is the constant variation?

1/2

300

Direct variation graphs always start at what point?

(0,0)

400

If a graph goes up 5 and right 3 what is the constant variation?

5/3

500

If a graph goes down 2 and right 3 what is the constant variation?

-2/3

direct variation equations

100

What is the direct variation equation?

y=kx

200

If y = 12 when x = 4, what is the constant variation?

3

300

If y = 20 when x = 4 what is the direct variation equation?

y = 5x

400

If y = 30 when x = 6, what is x when y = 25?

x = 5

500

If y = 42 when x = 6, what is x when y = 21?

x = 3