A department store is holding a drawing to give away free shopping sprees there are nine customers who have entered the drawing
1 answer:
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Answer:
(a) Output = 37
(b) Input = 9
Step-by-step explanation:
Given
Solving (a): Output, when input = 8
This means that, we solve for y when x = 8
So, we have:
Solving (b): Input, when output = 42
This means that, we solve for x when y = 42
So, we have:
Collect like terms
Divide both sides by 5
ANSWER
The correct answer is option B
EXPLANATION
The equations are
and
When we multiply the second equation by , we obtain;
When we combine this new equation with equation (1).
We can see that has been eliminated from the equation.
We can then, solve for and then substitute the result in to any of the equations to find
.
Hence the correct answer is option B