Question: and/or subtraction with multiplication method. Select the best answer with the format (x, y). 4x + y = -21 -4x+5y = 63 (-7, 7)

and/or subtraction with multiplication method. Select the best answer with the format (x, y). 4x + y = -21 -4x+5y = 63 (-7, 7) O (-13, 12) (1, 16) O (-9, 10) no solution infinite solutions 18. Convert the following equation to its alternate form (standard to slope-intercept or vice versa): 3x + y = 9

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