Unit Three Review

X and Y Intercepts

100

Find the y-intercept: 16x +3y= -21

-7

200

Find the x-intercept: 9x-3y= 24

Remember to write your answer as a simplified fraction if you need to. 

8/3

300

Find the x-intercept: 4y +7x= -12

x= -12/7

400

Find the x-intercept and y-intercept: 3x+ 5y= 15

x-intercept= 5

y-intercept= 3

500

Find both the x-intercept and y-intercept: 20x+8y=-5

x-int: -1/4

y-int: -5/8

Slope

100

What is the slope of a line that goes through these points: (0,6) (2,2)

-2

200

What does a slope of 0 look like?

-----------------

Straight line parallel to the x-axis

300

What does an undefined slope look like?

Straight up and down- straight line on the y-axis

400

What is the slope of the line that goes through these points: (-4,3) (2, -6)

-3/2

500

If a line crosses the y-intercept at (0,4) and crosses the x-intercept at (2,0), what is the slope of the line?

2

Direct Variation

100

What equation do you use for direct variation?

y=kx

200

In a direct variation, y=20 when x=4.

Write a direct variation equation that shows the relationship between x and y. 

y=5x

300

In a direct variation, y=80 when x=5.

 Write a direct variation equation that shows the relationship between x and y.

y=16x

400

In a direct variation, y=12 when x= –4.

Write a direct variation equation that shows the relationship between x and y.

y=-3x

500

In a direct variation, y= – 83.6 when  x=22.

 Write a direct variation equation that shows the relationship between x and y.

y= -3.8x

Arithmetic Sequences

100

Find the next number in this sequence: 

5, 8, 11, ____, 17, 20

14

200

Find the numbers that fit into the missing spaces in this arithmetic sequence: 

-62, _____, -42, -32, -22, _____, -2, 2

-52, -12

300

Find the numbers that fit into this sequence: 

.4, _____. 1.4, 1.9, ______, 2.9, 3.4

.9, 2.5

400

What is the value of the sequence for this set of numbers: 

1.13, 2.26, 3.39, 4.52, 5.65

+1.13

500

What is the missing number in this sequence? Be sure to simplify your answer if needed.

-1/8, -3/16, -1/4, ______, -3/8, -7/16

-5/16

Proportional Relationships

100

y=2x 

Fill in the missing numbers on the chart: 

x     y 

1      2

2     ____

____  6

4 

6

200

I receive $7.25 for each hour I work, with no starting bonus or overtime. Is this a proportional relationship?

Yes

300

Marvin has already taken 2 pictures at home, and he expects to take 1 picture during every day of vacation. Is the total number of pictures taken proportional to the number of days spent on vacation?

No

400

Gary already has 45 plants in his backyard, and he can also grow 7 plants with every seed packet he uses. Is the total number of plants in the backyard proportional to the number of seed packets used?

No

500

y= -2/5x

Fill in the missing spots on the chart: 

x        y  

5        -2

10     _____

-6     _____

-4

12/5