Question

Rozwiąż jeden uklad równań:

1/2(x-1)+y=-2 1/2
x-7=1-y

Answer 1

1/2(x-1)+y=-2 1/2          /*2
x-7=1-y

x - 1 + 2y = -5
x + y = 1 + 7

x + 2y = -4
x + y = 8         /*(-1)

x + 2y = -4
-x - y = -8
--------------------
y = -12

x + y = 8
x = 8 - y
x = 8 - (-12)
x = 8 + 12
x = 20

x = 20
y = -12