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i have found y11, y12, and y22 to match the answer that my text provides, but i am having trouble with y21

the solution given is y11 = 1.5, y12 = -0.5, y21 = 4, y22 = -0.5

in trying to solve for y21, i get 4.5

this is what i attempted:

short the voltage source at port 2

I

_{1}= (v

_{1}- v

_{a})/2 - v

_{1}

= -0.5(v

_{1}/2 - 3I

_{1}- v

_{1}) - v

_{1}

= -0.5(-0.5v

_{1}- 3I

_{1}) - v

_{1}

= 0.25v

_{1}+ 1.5I

_{1}- v

_{1}

-0.5I

_{1}= -0.75v

_{1}

I

_{2}= 3I

_{1}

I

_{1}= (1/3)I

_{2}

-0.5((1/3)I

_{2}) = -0.75v

_{1}

y21 = I

_{2}/v

_{1}= 18/4 = 4.5