Answer:
-2x + 3y = 6
Rearrange
-2x + 3y - 6 = 0
ax + by + ca = 0
a = -2
b = 3
If ca was a typo, and you meant c, then c = -6.
However, if ca wasn't a typo, then:
ca = -6
-2c = -6
c = -6 / -2
c = 3
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