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f(-3)= a. (-3) + b = -15
= -3a+ b = -15
f(-5) = a. (-5) + b = -5a + b
f(-3)=-15
f(x)=-3a+b=-15
= a+b=-15/-3
=a+b=5
a=5-b
a=5-3
a=2
-3a+b=-15
-3(5-b)=-15
-15+3b=-15
3b=-15+15
3b=0
b=3
f(x)=2x+3
f(-5)=2(-5)+3
= -10+3
= -7