Question

已知方程组{2A-3B=13,3A+5B=30.}9的解是{A=8.3,B=1.2

Answer 1

{2（X+2）-3（Y-1）=13,3（X+2)+5（Y-1)=30.9

x+2=A=8.3

x=6.3

y-1=B=1.2

y=2.2