Question

The graph shows the relationship between the total cost and the number of gift cards that Raj bought for raffle prizes.

What would be the cost for 5 of the gift cards?

$80
$90
$100
$110

Answer 1

The answer is C 100

Explanation:

Answer 2

$100

Explanation:

We can see from the graph that the rate of change is $20. This is because for every increase in x, the value of y increases by $20.

Going from this, the value at x=4 is $80; this will make the value at x=5

80+20 = 100.