That's not an equation, it is not solveable.
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Not sure if you mean 7x 6y as in 7*6y=126, where * means "multiplied by" and you must solve for y or if you mean that we must solve for both x and y, but the answer to the part where you are solving 7*6y=126 is 3.
6y + 1 = 19 Therefore, 6y = 18 y = 18/6 y = 3
3x - 6y = 9, 5x + 4y = -27 6x - 12y = 18, 15x + 12y = -81 21x = -63 x = -3 (3 x -3) = 9 + 6y (-9 - 9)/6 = y y = -3 Check: (5 x -3) + (4 x -3) = -15 -12 = -27 QED
y-3x+6y=12 7y=3x+12 y=3x/7 +12/7
If: 6y-3x = 18 Then: y = 0.5x+3 which is in slope-intercept form