exam Maths Puzzle Numerical Ability

x + Y = -3
2x - y = -3

Pls solve and show detail. Need to know if graph has one solution, no solution, or infinitely many solutions.

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exam Other Question

(x-5)(9x+4)=(3x-2)^2 A plane flies 560mi in 1.75 hr traveling with the wind. The return trip later against the same ind takes the plane 2 hrs. Find the speed of the plane and the speed of the wind.