Question

Oblicz układ równań :
2/3 x +3/4 y=5
3(x-y)=-3

Answer 1

2/3 x + 3/4 y= 5            |*12
3(x-y)= -3

8x+9y=60
3x-3y= -3      |*3

8x+9y=60
9x-9y= -9
----------------
17x   =51
x=3
9x-9y= -9
9*3-9y= -9
27-9y= -9
-9y= -36
y=4

x=3
y=4