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f(3 ) = 5
f (-1) = -3
3a + b = 5
-a + b = -3
----------------- -
4a = 8
a = 2
-a + b = -3
-2 + b = -3
b = -3 + 2
b = -1
f(4) = 2×4 - 1
f(4) = 8 -1
f(4) = 7
= 3a + b = 5 = -a + b = -3
--> 3a + b =5
-a + b =-3 f(4) =ax + b
----------------- - = 2.4 + (-1)
4a = 8 = 8 - 1
a --> 8:4 = 2 = 7
3a + b = 5
3.2 + b = 5
6 + b = 5
b--> 5-6 = -1