in the xy plane,the graph of the function F is a line.if F(2)=7an_英语解答

in the xy plane,the graph of the function F is a line.
if F(2)=7andF(12)=1,what is the value of F(7)=?

人气：107 ℃　时间：2020-03-28 04:34:24

解答

F(x)=kx+b
7=2k+b,1=12k+b
k=-3/5,b=41/5
F(x)=-3/5x+41/5
F(7)=-3/5*7+41/5=4

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