8th Parcial IV Review

Square Roots

100

sqrt(144)

12

200

x^2=36

6

300

x^2+11=36

5

400

7x^2=7

1

500

(x^2)/-5=-20

10

solve for the variable

100

4x+3= 15

x= 3

200

-4x-7=21

x = 7

300

(x-5)/-2=12

x = -19

400

-8(x+16)=-24

x = -13

500

(h+15)^2=49

h= -8

IntegersMultiply and Divide

100

-4 x 8

-32

200

-21 x -3

61

300

205 / -5

-41

400

-23 x -45

1035

500

-561 / 3

-187

Integers Add and Subtract

100

-1+-1

-2

200

-33-56

-89

300

101-123

-22

400

-54+202

148

500

-18-(-45)

-18+45
27

Systems of Equations

100

Find x

5y + 4x = 22

y = 2

5(2) + 4x = 22
10 + 4x = 22
4x = 12

x = 3

200

Is x = -3 , y = 5 a solution?

2x + 2y = -4

2(-3) + 2(5)

-6 + 10

4

Not a Solution

300

Using Elimination, what equation needs to be changed, and what is the new equation?

-2x+6y=12      A

-6x+4y =3       B

A
-3( -2x + 6y = 12 )

6x -18y = -36

400

Using Substitution: Solve for x

x=2y-1

x - 3y = 13

2y - 1 - 3y = 12
-y - 1 = 12
-y = 13

y = -13

500

Using Substitution: Solve fory

y=-x+2

4x - 3y = -34

4x - 3(-x+2) =-34

4x + 3x - 6 = -34

7x = -28

x = -4