If   , and    is increased by  3, what will be the corresponding increase in ?

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

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

1. $4
2. $20
3. $18
4. $29

What is the -intercept of the line  ?

Hannah went paddle boarding on a holiday.

The hiring charges are  listed in the table below:

Which linear equation shows the relationship between and ?

Suppose  .

When the value of    increases by 4, the value of    decreases by

1. .
2. .
3. . 
4. .

Marty is thinking of a number. Let the number be .

When Marty subtracts 4 from this number and multiplies the result by 7, the answer is 8 more than .

Which equation can be used to find ?