Current location - Training Enrollment Network - Mathematics courses - A function problem in mathematics of senior high school entrance examination
A function problem in mathematics of senior high school entrance examination
Suppose: the analytical formula of a straight line passing through three points A, B and C is; Y=mx+n, then m=- 1 is obtained by the method of undetermined coefficient, so the answers of B and C should be excluded. N=b+a, unless a and b are opposite numbers, and n=0, generally a straight line will not cross the origin. So we should rule out A, so we should choose D.