Roziąż układy równań:
a) 3x + y =9
2x - 5y = -11
b) 2x - 4y =4
3x - 2y =3
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a)
{3x + y =9 /*5
{2x - 5y = -11
{15x + 5y =45
{2x - 5y = -11
17x=34
x=2
y=3
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b)
{2x - 4y =4
{3x - 2y =3 /*(-2)
{2x - 4y =4
{-6x + 4y =-6
-4x=-2
x=1/2
y=-3/4