Are you sure about your solves??
I think correct answer is 6,
I don't know but the standard way is in the photo:
Subtract 925 from both sides
1578 - 925 = 8x
Simplify 1578 - 925 to 653
653 = 8x
Divide both sides by 8
653/8 = x
Switch sides
<u>x = 653/8</u>
Answer:
a) As weekly costs are fixed at $300, we simply need to shift the function up 300 units. (the new function is shown in blue on the attached graph).
b) Reading from the (blue) graph, the total cost of producing 75 books in a week is $600.
fixed cost + variable cost = $300 + $300 = $600
The rate of change is 1/2 as it is increasing by 50 per week