<u>Story Problem</u>
Mr. Bill Gates bought a house in Italy for 
and a house in Canada for 
. What is the total cost of the two houses?
we know that
The total cost is the sum of the cost each house
so
therefore
the answer is
The total cost is 
Point C.
f(-3) is basically substituting x = -3 and get the y-value.
So when we substitute x = -3. Focus on x-axis at x = -3 then look up for the y-value. If the y-value is on x = -3 then that's f(-3)
f(x)= -8x+4 to find the inverse replace f(x) with y and solve for x
y= -8x +4
y-4=-8x
x= - (y-4)/8
So you replace now x with f^-1(x) and y with x to get the answer:
f^-1(x)= - (x-4)/8
