y=2x-5
y=-x+1
两式相减
3x-6=0,x=2,y=-1所以A(2,-1)
y=2x-5与y轴交x=0,y=-5,(0,-5)
y=-x+1与y轴交x=0,y=1,(0,1)
所以面积=1/2*2*[1-(-5)]=6