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f(3)= 3a+b=15 - = -8+b=5
-5a =-20 = b =8+5
a = 4 = b = 13
f(x)=4x+13
f(5)=4.5+13
=20+13
=33
f(-2)=a.(-2)+b=-5
=-2a+b=-5
f(3)=a.3+b=15
=3a+b=15
-2a+b=-5
3a+b=15
_________ -
-5a=-20
a=-20/-5
a=4
-2a+b=-5
-2.4+b=-5
-8+b=-5
b=-5+8
b=3
f(5)=ax+b
f(5)=4.5+3
=20+3
=23