Question

4x—5y=5 2x+3y=—25用2元一次方程组的加减法怎么做说清楚点

Answer 1

4x—5y=5·······a

2x+3y=—25······b

bx2得

4x+6y=-50·····c

c-a得

11y=-55

y=-5

x=-5