F(x) = 5x − 1
and g(x) = 3x − 9
g(x) - f(x) = (3x − 9) - (5x − 1) ===> -2x-8
Step-by-step explanation:
<u>Step 1: Subtract the first part</u>
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<u>Step 2: Multiply both to get how much the brother drank</u>
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Answer: 1/2 Liters
Answer: x=5
Step-by-step explanation:
3x - x = 12 - 2
2x = 10
x = 10/2
x = 5
Answer: 84
<u>Step-by-step explanation:</u>
Set up a proportion as follows: 

Cross multiply: 12x = 7 × 144
Divide by 12: x = 7 × 12
Simplify: x = 84
Answer:
Yes
Step-by-step explanation:
They are proportional by a scale of 1.5