Question

x－y=－7 ｛ 2x－3y=－10 (解二元一次方程,用加减法,

Answer 1

x－y=－7①

2x－3y=－10②

①×3-②

3x-2x=-21+10

x=-11

代x=-11入①

-11-y=-7

y=-4

即：方程组的解为x=-11；y=-4