Just remember the rules for standard form, and work the equation until it meets all the rules.
Ax + By = C
1) x and y in order on the left side
2) constants on the right side
3) no fractions or decimals
4) the leading coefficient (A) cannot be negative
2x + 6 = y Subtract y from both sides
2x - (y) + 6 = y - (y)
2x - y + 6 = 0 Subtract 6 from both sides
2x - y + 6 - (6) = 0 - (6)
2x - y = -6 Done!
Ax + By = C
1) x and y in order on the left side
2) constants on the right side
3) no fractions or decimals
4) the leading coefficient (A) cannot be negative
2x + 6 = y Subtract y from both sides
2x - (y) + 6 = y - (y)
2x - y + 6 = 0 Subtract 6 from both sides
2x - y + 6 - (6) = 0 - (6)
2x - y = -6 Done!