when x = 0, y = 2

3(0) - y + 2 = 0 (substitute)

- y + 2 = 0 (simplify)

- y + 2 - 2 = 0 - 2 (isolate the variable)

- y / - 1 = - 2 / -1 (isolate pt.2, a variable is not isolated if it is negative)

y = 2

when x = -1, y = -1

3(-1) - y + 2 = 0

-3 - y + 2 = 0

- y - 1 = 0

- y - 1 + 1 = 0 + 1

- y / -1 = 1 / -1

y = -1

when x = -2, y = -4

3(-2) - y + 2 = 0

-6 - y + 2 = 0

- y - 4 = 0

- y - 4 + 4 = 0 + 4

- y / -1 = 4 / -1

y = -4

when x = 1, y = 5

3(1) - y + 2 = 0

3 - y + 2 = 0

- y + 5 = 0

- y + 5 - 5 = 0 - 5

- y / - 1 = - 5 / -1

y = 5

when x = 3, y = 11

3(3) - y + 2 = 0

9 - y + 2 = 0

- y + 11 = 0

- y + 11 - 11 = 0 - 11

- y / - 1 = - 11 / -1

y = 11

please let me know if there are any typographical errors or anything confusing ^^