[" 37.A particle is moving with a velocity "bar(v)=K(y|+x)" ,where "],[qquad [" A is a constant.The general cquation for its path is "],[" (1) "xy=" constant "," (2) "y^(2)=x^(2)+" constant "],[(3)y=x^(2)+" constant "," (4) "y^(2)=x+" constant "]]