Solving a system of linear equation in two variables
y=1/2 x+7y=3 ...
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