1. SECONDARY ONE 6.1a Using Substitution to Solve a System

2. HOW TO CHANGE AN EQUATION SO IT HAS NO FRACTIONS

4. HOW TO CHANGE AN EQUATION SO IT HAS NO DECIMALS Multiply each number by 10, 100, or 1000, … so there are no numbers behind a decimal. 0.3y = 2 – 0.8x1.1x = 3y – 0.4

6. 4 STEPS TO SOLVE A SYSTEM BY SUBSTITUTION 1. Solve one of the equations for one of its variables. 2. Substitute the expression from step 1 into the other equation and solve. 3. Substitute the value from step 2 into the equation form step 1 and solve. 4. Check the solution in each of the original equations.

7. SOLVE BY SUBSTITUTION y = x + 1 2x + y = -2

8. SOLVE BY SUBSTITUTION 2x + 2y = 3 x = 4y - 1

9. SOLVE BY SUBSTITUTION 2x+y=9 y=5x+2

10. SOLVE BY SUBSTITUTION