Question 28824
(1) 4x - y = -3 and 2x -3y = 1
*[invoke linear_substitution "x", "y",4,-1,-3,2,-3,1]

(2) 2x + 4y = -12 and 3x + 5y = -14
*[invoke linear_substitution "x", "y",2,4,-12,3,5,-14]

(3) 2x - 3y = 2 and -4x + 6y = 2
*[invoke linear_substitution "x", "y",2,-3,2,-4,6,2]
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