exam Maths Puzzle Numerical Ability

how do you get f(a)=2a+3
f(z)=z+9.5
f(d)=1-4d
f(h)=-6h-2/3
f(t)=1/2t-2

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exam Other Question

find the equation of the line through the points (-2,4) parallel to the line
2x+7y=9

i tried solving for "y" but was not really sure if i was doing it right
or what to do after
-a/b=-2/7
please help me

which conic section is represented by the equation 4x^2-4xy+y^2+4x-2y+1=0

A.ellipse
B.2lines
C.hyperbola
D.1 line
E.n/a