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{0,8x + 0,6y = 10
{ -0,8x - 1,6y = -16
+ { 0,8x + 0,6y = 10
________________
-y = -6
y = 6
0,2x + 0,4y = 4
wstawiamy 6 pod wartość y
0,2x + 0,4 * 6 = 4
0,2x + 2,4 = 4
0,2x = 1,6
x = 1,6 : 0,2
x = 8
{ x = 8
{ y = 6