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The Pythagorean Theorem states that for a right triangle

In terms of points in the Cartesian plane a is equal to

And

Therefore,

Here since ,

We already know the value of c

There are 2 cases

1st Case :

y+1 is equal to the positive squareroot of 9

2nd case:

y+1 is equal to the negative squareroot of 9

Therefore y={-4, 2}

Either of the two are possible

The Pythagorean Theorem states that for a right triangle

In terms of points in the Cartesian plane a is equal to

And

Therefore,

Here since ,

We already know the value of c

There are 2 cases

1st Case :

y+1 is equal to the positive squareroot of 9

2nd case:

y+1 is equal to the negative squareroot of 9

Therefore y={-4, 2}

Either of the two are possible