1.) Which system of equations below give the solution (-1,-2) ?

(1)

(3)

y = x - 3

y = - x - 1

y = - x - 3

y = x - 1

(2)

y = x - 3

(4)

y = - x - 3

y=-x-1

y = x - 1

Which triangle must be a right and why

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