(1)由于x=3-2t,y=-1-4t,则 2x-y=2(3-2t)-(-1-4t)=7.即普通方程为2x-y-7=0.(2)由于x=5cosθ+1 y=5sinθ—1 ,则 (x-1)^2+(y+1)^2=(5cosθ)^2+(5sinθ)^2=25,且 x属于(-4,6),y属于(-6,4).即普通方程为(x-1)^2+(y+1)^2=2...