Question

The table shows the ratio between the number of books ordered and their cost:

Answer 1

7 books costs $14, etc.  We have points in a line

(7,14)

(8,16)

(9,18)

They're all points on the line y=2x which just means it costs $2 a book.  So 1 book costs $2, 2 cost $4, and 3 cost $6.  We have three new points:

(1,2)

(2,4)

(3,6)

They're all on the same line, y=2x, just closer to the origin than the first three. We plot a point at x=1, y=2,  etc.

Merry Christmas

Answer 2

Answer:

Number of books   Cost (dollars)

        1                            2

        2                            4

        3                            6

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(1,2)

Start from the origin and move 1 unit to the right and 2 units up.

(2,4)

Start from the origin and move 2  units to the right and 4 units up.

(3,6)

Start from the origin and move 3 units to the right and 6 units up.

Step-by-step explanation: