SofE: Substitution

Solve the system by substitution. 
-5x - 4y = -9
y = 6

• (3, 6)
• (6, -3)
• (-3, 6)
• (6.8, 3)

The first step in solving using the substitution method is __________.

• get x by itself
• get y by itself
• get either variable by itself
• add the equations together

Solve the system of equations:
y=2x
x + y = 9

• (6, 3)
• (3, 6)
• (-3, -6)
• no solution

Solve:
y=8x+1
y=6x+3

• (1, 9)
• (4, 14)
• (0, 1)
• (2, 4)

Solve for x and y
y = 2x + 1
y = 4x - 1

• (1,3)
• (-1,-3)
• (-1,3)
• (3,1)

y=2x+11

3x + y = 1

• (4, -1)

• (8, -1)

• (6,5)

• (-2, 7)

2x-9y=43

y=4x+33

• (-10, -7)

• (-7, 10)

• (10,5)

• (0, 0)

What is the solution to this system?
x - y = 6
y = 2x - 5

• (1,3)
• (-1,3)
• (-1,-7)
• (1,-7)

Solve:

x = -3y - 17

2x + 3y = -7

• (1, -20)

• (10, 0)

• (-5, -2)

• (10 , -9)

What is the solution to the system of equations?

y = 3x - 8

y = 4 - x

• (3,1)

• (1,3)

• (3,-1)

• (3,-1)