Question

Решите систему уравнений!!!
3x+5y=12 
x-2y=-7

Answer 1

х=2у-7
3(2у-7)+5у=12
6у-21+5у=12
11у=33
у=3
х=2*3-7=6-7=-1

Answer 2

((3 x+5 y)-(12 x-2 y), {x, y}) 
((3 x+5 y)-(12 x-2 y), x^2-1, x)
((3 x+5 y)-(12 x-2 y))