Question

решите систему уравнений 3x-2y=7 ,5x+2y=1

Answer 1

$\left \{{{3x-2y=7}\atop{5x+2y=1}} \right.\\  +\left\{{{3x-2y=7}\atop{5x+2y=1}}\right.\\ 3x+5x-2y+2y=7+1\\ 8x=8\\ x=1\\ y=\frac{1-5x}{2}=\big[x=1 \big]=<span>\frac{1-5}{2}=-2\\ </span>\left \{{{<span>x=1}\atop{y=-2}}\right.\\ </span>Answer: (1;-2)$