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f( -3) =19
f(4) = - 9
f( -5) = ?
f ( -3 ) = -3m + n = 19
f( 4 ) = 4m + n = -9
-7 m. = 28
m = -28/7
m = -4
-3 ( -4) + n = 19
12 + n = 19
n = 19 - 12
n = 7
f( -5) = -5 ( -4 ) + 7
= 20 + 7
= 27