0
Since 2x - y = 1, we can add y to both sides,
so that 2x = 1 + y, and then subtract 1
so that 2x - 1 = y.
We can then sub. this value of y into the other equation.
x - 2y = -4
x - 2(2x - 1) = -4
x - 4x + 2 = -4
-3x + 2 = -4
-3x = -2
x = (-2)/(-3)
So x is equal to two-thirds.
We finish by substituting this x value into the first equation.
y = 2(2/3) - 1
y = 1/3
So y is equal to one third.
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