Two Step Equations Final

FOLLOW THE STEPS!! 
Solve the system of equations:
x = 2
4x + 8 = y
1.  Substitute x for 2 in the 2nd equation
2.  Add the numbers. 
3.  Your answer is (x,y) 

• (2, 16)

• (2, 6)

FOLLOW THE STEPS!! 
Solve the system of equations:
y = 2
x + y = 2
1.  Substitute y for 2 in the 2nd equation
2.  Subtract 2 from both sides 
3.  Your answer is (x,y) 

• (0, 2)

• (2, 2)

FOLLOW THE STEPS!! 
Solve this systems of equations
x + y = 7
y = 4
1. Substitute y for 4 in the second equation
2. Subtract 4 from both sides 
Your answer is (x,y)

• (3,4)

• (-1, 4)

• No solution 

• Infinite solutions

What is the first step in solving this equation for x? 
2x + 2 = 6

• Subtract 2 from both sides

• Add 2 to both sides

FOLLOW THE STEPS! 
Solve the system by substitution.
2x - y = 7
y = 3
1.  Plug 2 into the 1st equation 2x - 3 = 7
2.  Add 3 to both sides
3.  Divide by 2
Answer is (x,y)

• (5,3) 

• (8,3) 

Jacob solved the following equation using the steps shown.

Step 1 5x + 9 = 2x - 3

Step 2 3x + 9 = -3

Step 3 3x = -12

Step 4 x = -4

What operation did he perform to get from Step 1 to Step 2?

• Subtracted 2x from both sides of the equation

• Subtracted 9 from both sides of the equation

• Multiplied both sides of the equation by 3

• Added -3 to both sides of the equation

What is the first step to solve this equation:

11 - 3x = 44

• Add 3 to both sides

• Subtract 11 from both sides

• Add 11 to both sides

• Divide 3 on both sides.

What is the next step you should take?

• subtract 1 to both sides

• collect the numbers to the right

• add 1 to both sides

• multiply 18 to both sides

What is the final answer to

10 + 2n = 8n - 2n + 10 ?

• 12

• 5

• 0

• -15

What is the next step you should take?

-11b + 8 = -3

• subtract 8 from both sides

• add -3 to both sides

• divide 8 to both sides

• multiply 3 to both sides