Chapter 2 8th review

Solve equations

100

2x + 6x =1,000

x=125

200

-2.3x - 4.2x= -66.3

x = 10.2

300

2x + 21 = 7x +6

3

400

Megan has $50 and saves $13 each week.  Connor has $20 and saves $16 each week.  After how many weeks will Megan and Connor have saved the same amount?

x=10 weeks

500

Jim bought a gym set for $90.  The cost was 30% off the original price.  What was the price of the gym set before the sale?

x=$128.57

Multistep Equations

100

4(x+4) + 2x = 52

x=6

200

3(2x+3x+2)=3x+30

x=2

300

8x + 2= 2x + 4(x+3) 

x=5

400

5(x+5)= x+65

x=10

500

2/3x - 1/3x+11 = 8

x=-9

One solution, no solution, infinite solutions

100

6x+9 = 2x + 4 + 4x +5

infinite

200

2(6x + 9 -3x) = 5x + 21

no solution

300

x + 5.5 + 8 = 5x - 13.5 - 4x

no solution

13.5 does not equal -13.5

400

4(1/2x +3) = 3x + 12 -x

infinite solution

500

3(2x + 5) = 2(3x + 3)

no solution

Graphing a line

100

graph y=2x

see board

200

Graph y= 1/2x - 1

see board

300

What is the y intercept of y= 5+ 2x

5

400

Graph this line, what is the slope?

y= 4x-8

4

500

What is the equation of the line drawn on the board?

y= -2x +6

Miscellaneous

100

What is the slope of these two points 

(1,5) (3,8)

3/2

200

Which train is faster?

Train A

Time.  (h)          2.    3.    4.    5.     6. 

Distance.(mi)    50.  75. 100. 125. 150

or Train B    the graph on the board

Train A went 25/hr

Train B went 20/h

so A went faster

300

What is the y intercept of the graph on the board?

what is 5

400

What is the square root of 64?

8

500

What is 9^2 - 2^3

73