The coorrdinate grids show the cost of different numbers of bookmarks .How many cents do 4 bookmarks cost?

54 cents

Step-by-step explanation:

The cost of bookmarks relating to the number of bookmarks is shown in the coordinate grid. x represents the number of bookmarks and y represents the cost of each bookmark in cents.

The equation of a line passing through the points is given by:

From the coordinate grid, it has the points (2, 30) and (7, 90). Therefore, the equation is:

Therefore the cost of 4 bookmarks (x = 4):

y = 12(4) + 6

y = 48 + 6

y = 54 cents

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