Question

{4x-y=5
{3x + 2y = 12​

Answer 1

Ответ:

{4x-y=5

{3x+2y=12;

{y=-5+4x

{3x+2y=12;

3x+2(-5+4x)=12;

x=2;

y=-5+4×2;

y=3;

(x,y)=(2,3);

{4×2-3=5

{3×2+2×3=12;

{5=5

{12=12;

(x,y)=(2,3).