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?
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