UNIT 3 Review

Is it a solution to the equation/inequality?

100

 3(x-7) + 10 = 30 

when x=9

3(9-7)+10=30 

3(2)+10=30 

6 + 10 = 30 

16=30 

No 

200

2x + 5 >13

when x=4

2(4)+5 >13 

8 +5 >13 

13 >13 

No 

300

2n +9 ≤ -1 

What is n? n=2, n=6, n=0, or n=-6

2n +9 ≤ -1 

-9           -9

2n≤-10

___   ___

-2       -2

n ≥ 5

n=6

400

4(x+8)+12=40 when x=4

4(4+8)+12=40

4(12)+12=40

48+12=40

50=40

No

500

3x+4<25 when x=2

3x+4<25 

3(2)+4<25

6+4<25

10<25

Yes

SOLVE

100

 8x+9=49

 8x+9=49

-9         -9

8x=40

___ ___

8       8

x=5

200

y/7-2=-10

y/7-2=-10

     +2   +2

7 x y/7=-8 x 7

y=-56

300

4p-12=-14

4p-12=-14

   +12    +12

4p=-2

__   __

4     4

p=-1/2

400

9(x+4)=54

9(x+4)=54

9x+36=54 

     -36   -36

9x=18

__   __

9      9

x=2

500

18-3n=30

18-3n=30

-18      -18

-3n=12

__   __

-3    -3

n=-8

Does the inequality match the graph?

100

4x-6≥-14

4x-6≥-14

x≥-2

200

4/5x-6<18

4/5x-6<18

x<30

300

-3x+16>-11

-3x+16>-11

x<9

REVERSE THE SIGN

400

-5x+15<25

GRAPH YOUR OWN

x<-2

500

12+2x≥42

GRAPH YOUR OWN

x≥15