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h(5) =5a + b h(4) = 4a +b
16 = 5a + b .... (1) 11= 4a + b .... (2)
5a + b = 16 4a + b = 11
4a + b = 11 20 + b =11
a = 5 b = -9
h(-1)= -a + b
= -5 -9
= -14