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{a+ b = 10
{a-b = -30
2a = -20
a= -10
b= 10- a= 10- (-10)= 20
y-druga liczba
{x+y=10
{x-y=-30
{x=10-y
{x-y=-30
10-y-y=-30 |-10
-2y=-40 |: (-2)
y= 20
x=10-20= -10
Odp:Pierwsza liczba to -10 a druga to 20.
x-y=-30
x=10-y
10-y-y=-30
-2y=-40
y=20
x+20=10
x=-10