Answer:
f(x) = - 3x + 4
Step-by-step explanation:
Note that y = f(x)
Given
9x + 3y = 12 ← rearrange making y the subject
Subtract 9x from both sides
3y = - 9x + 12 ( divide all terms by 3 )
y = - 3x + 4, that is
x/7=x+14 / 5
Solve for X
109
Hope this helped :)
she is incorrect because if she was given a 20% discount the amount she would have to pay is 38.4
48 x .2 = 9.6
48 - 9.6 = 38.4 not 40
