# L5 Teacher's Notes Topic: Alg - substitution How could we change the question? Eg: what if x = 7 etc what if the expression is 6x etc What mistake do you.

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L5 Teacher's Notes Topic: Alg - substitution How could we change the question? Eg: what if x = 7 etc what if the expression is 6x etc What mistake do you make to get each wrong answer? x = 8 (a) When x = 8, what is the value of 5x ? Tick (  ) the correct box. 5 134058 none of these How could we change the question? Eg: what if x = 7 etc what if the expression is 4x - x etc what if the expression is 5x + x etc (c) When x = 8, what is the value of x 2 ? Tick (  ) the correct box. 8 101664 none of these (b) When x = 8, what is the value of 3x - x ? Tick (  ) the correct box. 0 31630 none of these How could we change the question? What if the answer to x 2 is 25 - what is x ? 169 196 4 1 -9

x = 8 5134058 none of these (a) When x = 8, what is the value of 5x ? Tick (  ) the correct box.

0 31630 none of these (b) When x = 8, what is the value of 3x - x ? Tick (  ) the correct box.

8 101664 none of these (c) When x = 8, what is the value of x 2 ? Tick (  ) the correct box.

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