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secondary 2 | Maths

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need help

x + 2y + 6 = 0

(Do you know why both must be zero?)

x = -2y - 6

Then,

2 (-2y - 6) - 7y + 1 = 0

-4y - 12 - 7y + 1 = 0

-11y - 11 = 0

-11y = 11

y = -1

x = -2 (-1) - 6

x = -4

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