Question

Obliczanie układów równań metodą podstawiania. Help!

Answer 1

1. 2(x-1)+3(y-2)=5
3(x+y)-2(x-2)=7

2x-2+3y-6=5 |+8
3x+3y-2x+4=7 |-4

2x+3y=13
x+3y=3 |·(-2)

2x+3y=13
-2x-6y=-6

-3y=7
y=-2i 1/3

x+3y=3
x-7=3
x=10

2. 2/5x+y=6|·5
x+3/4y=8|·4

2x+5y=30|·(-2)
4x+3y=32

-4x-10y=-60
4x+3y=32

-7y=-28
y=4

2x+5y=30
x=5