Question

1.Rozwiaz podany uklad rownan metoda podstawiania 3(x-2y) = -9
4x +3y = 10

Answer 1

3(x-2y)=-9  /:3
4x+3y=10

x-2y=-3  ⇒ x=2y-3

4(2y-3)+3y=10
8y-12+3y=10
11y=22
y=2
x=2*2-3=1