题库搜索>问题求解PS-13420
In the xy-plane, if line k passes through the points
(3.-4) and (a,b), where b=4a-16 and a≠3,
what is the slope of k?
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设y=kx+d, 因为通过（3，－4），所以（1）3k+d=-4, 因为通过（a,b), 并且b=4a-16, a又不等于3， 我们就假设a=4, 所以b=0, 所以y=kx+d还通过（4，0），所以(2) 4k+d=0, 综合（1）（2），求出k=4
石头人
根据K通过（3，4）和(a,b)点，按斜率公式（Y2-Y1)/(X2-X1)得（b+4)/(a-3)=k,又因为b=4a-16, 将b值代入后得：（4a-16+4)/(a-3)=k, 化简之后为：（4a-12)/(a-3)=k 此时，a 可以取任意正整数（如：1，2，3。。。）得k 值圴为4
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2017-09-26 08:53:20
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