smc-1118-40-Other problems

Algebra, STD2 A2 2020 HSC 6 MC

Suppose .

When the value of increases by 5, the value of decreases by

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Renee went bike riding on a holiday.

The hiring charges are listed in the table below:

Which linear equation shows the relationship between and ?

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The total cost, , of a school excursion is given by , where is the number of students.

If three extra students go on the excursion, by how much does the total cost increase?

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If , and is increased by 2, what will be the corresponding increase in ?

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♦ Mean mark 50%.
STRATEGY: Substituting real numbers into the equation can work well in these type of questions. eg. If

and when