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12-01-2017
Mathematics

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Solve the system of the linear equation by adding or subtracting.

6x+y=13
3x+y=4

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antonio9990 antonio9990

12-01-2017

6x+y=13 / *(-1)
3x+y=4
-------------
-6x-y= -13
3x+y = 4
========== + + +
-3x / = -9
x=2

x=2 => 3x+y=4
3*2 + y=4
6+y=4
y=4-6
y= - 2

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