Standard form is in the form of Ax+By=C . A must be positive, not a fraction. So, this one is 4x-y=-7 because the coefficient of x has to be changed.
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3y = 4x + 9 -4x + 3y = 9 is the standard form
-4x + 3y = 9
-3
4x - 11 = 0
In standard form it is 4x - 4y = 6 or 2x - 2y = 3