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f ( - 2 ) = -2a + b = 14
f ( 3 ) = 3a + b = - 1 -
-5a = 15
a = -3
-2a + b = 14
-2 ( -3 ) + b = 14
6 + b = 14
b = 14 - 6
b = 8
f( x ) = ax + b
f ( 7 ) = 3 ( 7 ) + 8
= 21 + 8
= 29