P(4,2) and R(-2,0) are vertices of a rhombus PQRS. What is the equation of diagonal QS.

P(4,2) and R(-2,0) are vertices of a rhombus PQRS. What is the equation of diagonal QS.
1). x - 3y = -2
2). 3x + y = 4
3). 3x + y = -4
4). x - 3y = 2

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