Substitution/Elimination

distribute

100

2x(3)

6x

200

2(2x+5)

4x+5

300

-1(2x+35y-20)

-2x-35y+20

400

-3(6x-7y+5)

-18x+21y-15

500

2x(x²+4x-3)

2x³+8x²-6x

combine like terms

100

2x+3x+8

5x+8

200

20x-5x+3y+2y-4+7

15x+5y+3

300

-2y-7x+9y-6+8x-3+1

x+7y-8

400

3a+4b-3a

4b

500

3a-5b+4a-8b-9y

7a-13b-9y

solve equations

100

x + 12 = 10

x=-12

200

7 − 3x = 34

x=-9

300

31 − 12x = 211

x=-15

400

− 4(x − 1) = 4 − 4x

0=0

500

− 5x + 8x =− 12x + 1 + 3(1 + 4x)

x=4/3

substitution

100

3x + 3y =− 18

y=2x

(-2,-4)

200

y =− 6x + 14

y = 8x

(1,8)

300

y=2x-3

y+2x=9

(3,3)

400

x =− 2y + 2

3x − 4y = 26

(6,-2)

500

y = x + 4

2y − x = 7

(-1,3)

elimination

100

4x − 3y = 6

2x + 3y = 12

(3,2)

200

− 6x + 3y = 6

- 6x + y =− 65

(16.75,35.5)

300

-8x-5y=-17

-2x+y=-11

(4,-3)

400

5x + 2y = 21

− x − y =− 9

(1,8)

500

2X+14y=48

3x-27y=-72

(24,0)