Question

Please answer quickly:

Answer 1

You need to have variables one one side and constants on the other.  ax - ax + by = c - ax by = c - ax by/b = (c - ax)/b y = (c - ax)/b

Answer 2

You said . . . . . ax + by = c

Subtract ' ax ' from each side . . . by = c - ax

Divide each side by ' b ' . . . y = (c - ax) / b