2 answers
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y = 2/3 * x - 1 and y = 2/3 * x - 2 - One Solution
x - 2y = 6 and 3x - 6y = 18 - One Solution
y = 5x + 7 and 3y - 15x = 18 - No solutions
3x + 6 = y and y = - 1/3 * x - 4 - Infinite solutions