The equations that are correctly written in standard form are
A. 3/7x + 2y =9
C. 5x – 4y = 9
D. -3x + 7y = 12
From the question, we are to determine which of the given equations are written in standard form
The standard form of a linear equation is Ax + By = C.
Where A, B, and C are constants,
and
x and y are variables
Hence, the equations that are correctly written in standard form are
A. 3/7x + 2y =9
C. 5x – 4y = 9
D. -3x + 7y = 12
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