y=2x+1 -2x+3y=-9 求算X和Y
问题描述:
y=2x+1 -2x+3y=-9 求算X和Y
y=2x+1
-2x+3y=-9
求算X和Y
答
-2x+3(2x+1)=-9
4x+3=-9
x=-3
y=2×(-3)+1
=-5