7.2: Solving Systems of Equations Using Substitution

Know the Y

100

y = 4

x + y = 8

(4, 4)

200

y = -11

4x + 2y 

(10 , -11)

300

y = 6

-3x + 10y = 90

(-10, 6)

400

y = 4x

x + y = 25

(5, 20)

500

y = -3x + 1

2x + 2y = 6

(-1, 4)

Know the X

100

x = 1

x + 4y = 9

(1, 2)

200

x = 2 + y

y = 4x + 7

(-3 , -5)

300

x = 4y

-x + 3y = 6

(-24, -6)

400

x = -5

4x + 2y = 30

(-5, 25)

500

x = 2y

y = 2x + 9

(-6, -3)

Move It!

100

2y = 6

y = 5x - 7

(2, 3)

200

4x = 16

x + y = 20

(4 , 16)

300

2x + y = 14

y = x + 2

(4 , 6)

400

-3x = 9

x + 5y = 17

(-3 , 4)

500

5y = 15x + 20

2x = 8

(4 , 16)

Mixed Review 1

100

y = 7x + 4

-11y = 33

(-1 , -3)

200

y = 4x + 12

y = 2x

(-6, -12)

300

2y = 6x + 10

y = 3x + 5

I/M

400

4x + 2y = 16

y = -2x

No Solution

500

2x + y = 15

4x = 8y

(6, 3)

Mixed Review 2

100

10y = 0

9x + y = 27

(3 , 0 )

200

3x = 15

2x + 10y = 10

(5 , 0)

300

y = x + 5

-5x + 5y = 5

No Solution (Parallel)

400

y = -3x + 1

3x + y = 1

I/M

500

9x = 81

4x + 2y = 8

(9 , -14)