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Question

y=(12)x+7
y=3x
Consider the system of equation above. If (x, y) is a solution to the system of equation. Then what is the value of y + x?

A
2.8
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B
8.4
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C
11.2
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D
9.6
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Solution

The correct option is C 11.2
Since, these equations are already given in terms of y and x, let's just equate them and find the values.
3x=(12)x+7
6x=x+14
5x=14
X=145
Use the value of x in "y = 3x".
y=425
Therefore y + x = 56/5 = 11.2

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