Math Review

Elimination

100

4x−9y=14 and -5x+5y= -5

x=-1

y=-2

200

x−6y=11

−6x+6y=-6

-1, -2

300

4x-2y=-6

x+4y=-24

(-4,-5)

400

6x-3y=-30

3x-6y=12

(-2,6)

500

−3x−6y=63 and x+y=−11

x=-1

y=-10

Substitution

100

10x-2=-16

y=3x

x=-4

y=-12

200

-2x-4y=-18

x=y

y=3

x=3

300

7x+9y=-45

-2y=x

y=9

x=-18

400

3x-8y=-50

6y=x

x=-30

y=-5

500

-x+7=30

x=7y

x=-35

y=-5

adding fractions

100

6 1/3 + 2 3/4 

9 1/2 

200

48/12 + 1 6/12 (simplest form is the answer)

5 1/2 

300

1/2 + 68/50 

1 43/50

400

4 6/5 +8 12/2 ( in simplest form is correct) 

19 1/5

500

1 1/2 + 6 20/100

7 70/100

multiplying fractions

100

1 1/2 x 1 1/2

2 1/4

200

6 48/50 x 1 25/50 (simplest form is the answer)

261

300

1 1/2 x 6 3/4 

10 1/8 

400

2 12/48 x 3 24/30 (in simplest form is the answer)

8 11/20

500

3 3/4 x 4 12/24 (in simplest form)

20 1/4

Math Facts

100

1 1/2 + 6 7/10= what (in simplest form)

8 1/5

200

1222/4 (is a decimal)

305.5

300

4x6000 

24000

400

120x460

55200

500

4 40/100 + 12 12/25= what (in simplest form)

16 22/25