The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes)
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the function f(x) = 4(x+3) − 5
Lets find the inverse function f^-1(x)
step 1: Replace f(x) with y
y = 4(x+3) − 5
step 2: Replace x with y and y with x
x = 4(y+3) - 5
step 3: Solve for y
x = 4(y+3) - 5
x = 4y +12 -5
x= 4y + 7 (subtract 7 on both sides)
x - 7 = 4y (divide by 4 on both sides)
Given : x = 3
We plug in 3 for x in the inverse function
= -1
the inverse function when x = 3 is -1
'is' in mathematics means the equal sign
'of' in mathematics means the multiplication sign
the number can be any variable you chose it to be
Divide both sides by 28
Multiply by 100 on both sides to isolate 'x'
14 is 28% of 200
'of' in mathematics means the multiplication sign
the number can be any variable you chose it to be
Divide both sides by 28
Multiply by 100 on both sides to isolate 'x'
14 is 28% of 200