求教MATH，谢谢

lololo

一、If y=ax+b, where a and b are constants, what is the value of y when x=10? 1.when x=1,y=5 2.when x=5,y=13 答案C 1显然不对，因为可能是a=b+/-1 但是我觉得2就可以了 因为13=6a+/-1,只能取-，从而a=b-1,不然就不是整数了 虽然其中没有说A。B是整数但是不是整数的话谈何连续？ 二、 a discount of 20 percent on an oder of goods followed by a discount of 10 percent amouts to the same as a discount of 10percent followed by a discount of 20 percent? that is to say any discont is made on the basis of origin price?