2. Algebra Substitution

3. Next example Previous example EasyMediumHard Graded exercises Easy 1 Easy 2 Medium 1 Medium 2 Hard 1 Hard 2 © Rosemary Vellar Instructions for use  There are 6 worked examples shown in this PowerPoint plus additional exercises (linked to word documents).  A red dot will appear top right of screen to proceed to the next slide.  You can either click on the navigation bar to the left of screen to go straight to one of the worked examples or use the buttons below.

4. Next example Previous example EasyMediumHard Graded exercises Easy 1 Easy 2 Medium 1 Medium 2 Hard 1 Hard 2 © Rosemary Vellar Question Substitute x = 5 into the expression x + 4 Method Step 1 Write down the expression x + 4 x + 4 = 5 + 4 Step 2 Substitute the value given for x in the question Step 3 Simplify your answer. = 9

5. Next example Previous example EasyMediumHard Graded exercises Easy 1 Easy 2 Medium 1 Medium 2 Hard 1 Hard 2 © Rosemary Vellar Question Substitute x = 3 into the expression 2x + 1 Method Step 1 Write down the expression 2 x + 1 2 x + 1 = 2  3 + 1 Step 2 Substitute the value given for x in the question. Step 3 Simplify your answer. = 6 + 1 = 7 Remember that 2x means 2  x

6. Next example Previous example EasyMediumHard Graded exercises Easy 1 Easy 2 Medium 1 Medium 2 Hard 1 Hard 2 © Rosemary Vellar Question Substitute x = 4 into the expression x 2  2 Method Step 1 Write down the expression x 2  2 x 2  2 Step 2 Substitute the value given for x in the question. = 4 2  2 Step 3 Simplify your answer. = 16  2 = 14 Remember that 4 2 means 4  4

7. Next example Previous example EasyMediumHard Graded exercises Easy 1 Easy 2 Medium 1 Medium 2 Hard 1 Hard 2 © Rosemary Vellar Question If p = 2 and q = 4 find the value of q  3p Method Step 1 Write down the expression q  3p q  3 p Step 2 Substitute the value given for each pronumeral q and p = 4  3  2 Step 3 Simplify your answer. = 4  6 =  2 Remember the order of operations.

8. Next example Previous example EasyMediumHard Graded exercises Easy 1 Easy 2 Medium 1 Medium 2 Hard 1 Hard 2 © Rosemary Vellar Question If p = 2 and r = 5, evaluate the expression r(2r – p) Method Step 1 Write down the expression Step 2 Substitute the value given for each pronumeral p and r Step 3 Simplify your answer. r (2 r  p) = 5 (2  5  2) = 5 (10  2) = 5  8 = 40

9. Next example Previous example EasyMediumHard Graded exercises Easy 1 Easy 2 Medium 1 Medium 2 Hard 1 Hard 2 © Rosemary Vellar Question If x =  3, y = 4 and z = 2, evaluate Method Step 1 Write down the expression Step 2 Substitute the value given for each pronumeral x, y and z Step 3 Simplify your answer.

10. Next example Previous example EasyMediumHard Graded exercises Easy 1 Easy 2 Medium 1 Medium 2 Hard 1 Hard 2 © Rosemary Vellar Last slide Use the navigation buttons to repeat selected slides or to go to the graded exercises