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Verified answer
CaraVerified answer
A)f(3)=3a+b=15f(5)=5a+b=20
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-2a=-5
a=5/2
3a+b=15
15/2+b=15
b=15-15/2
b=15/2
b)f(x)=5/2x+15/2
c)f(-4)=5/2.-4 + 15/2
=-5/2