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To solve for 2 unknown variables you need 2 independent equations. You have only 1.
(0, -3)
(3, 1)
5x+18 = 2x+9 5x-2x = 9-18 3x = -9 x = -3 and y = 3
The answer is - not are - (-6, 9).
Both equations are equal and so: 3x+1 = 2x+3 3x-2x = 3-1 x = 2 and by substituting y = 7