Question

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

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

Answer 1

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