Answer:
#6 is A, the accountant's hourly rate of $55 per hour. #7 is B, $80
Explanation:
The slope represents an hourly rate because unlike the standard fee or the tax amount, the slope is always what is growing in the problem. Since she is paid by the hour, the graph would have to have different points for each our. I figured this out by going to where the point for 1 hour meets the line and seeing how much has been added to the original $80. For B, the starting point is $80. I figured this out by seeing that the original fee to complete a tax return is $80, there is no way that the accountant would be payed any less for a tax return.