Download Substitution - Baldwin School District

Name________________________________________Date______________8th Grade
Aim
How do we solve systems of equations using substitution?
Warm Up
Solve the system of
equations graphically.
y = 4x – 4
y = 2x + 2
Solution:______________
Whole Group Questions
Solve each system of equations
using substitution. Check.
1.
y = 4x – 4
y = 2x + 2
Substitution
Step 1: Solve any equation for any unknown value.
Step 2: Substitute Step 1 into the other equation.
Step 3: Substitute Step 2’s solution into Step 1.
Step 4: Check your answer.
2.
y = 2x – 10
y = -3x + 10
Substitution
Step 1: Solve any equation for any unknown value.
Step 2: Substitute Step 1 into the other equation.
Step 3: Substitute Step 2’s solution into Step 1.
Step 4: Check your answer.
3.
y = 5x – 2
x = 2y + 4
Group Work Questions
Solve each system of equations using substitution. Check.
1.
y = 6x – 9
y = 2x + 7
2.
y = 4x – 3
y = -2x + 9
3.
y = 2x + 1
x = 3y + 2
Homework
Solve the system of equations using substitution. Check.
y = 6x – 5
y = x + 10