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f(-5) = -5a+b = -25
-----> 8a = 32 <=> a = 4
3a + b = 7
3x4 + b = 7
12 + b = 7
b = -5
a.3+b = 7
f(-5) = -25
a.(-5)+b = -25
3a+b = 7
-5a+b = -25
------------------- (-)
8a =32
a=32/8= 4
3a+b = 7
3(4) + b = 7
12+b = 7
b = 7-12
b = -5
f(x) = 4x-5