Question

# Jhon draws a trend line for the scatter plot in item 3 and writes the equation y = 6.5x + 12 to represent the line. Use her equation to predict how much she will spend if she buys 7 books

- $45
- $57.5
- $65
- $11

Hint:

### Put x=7 in the given equation of line to find the cost when she buys 7 books.

## The correct answer is: $57.5

### STEP BY STEP SOLUTION

The trend line = 6.5x + 12

So, the expenditure on 7 books is equals to

y = 6.5 x 7 + 12 = 57.5

The total cost =$57.5

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