book Maths Puzzle Numerical Ability

Passes through (-6,-4) and (-1,9)

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the answer to the following should be 4/3a, however, I cannot understand how - please help! Thank you!!

1/1.5 + 1/1.5= Let f(x)=2x-3and g(x)=x+3. FInd the composite function. (f0g)(7)Thanks for the help!