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When the equation is in the form "y = mx + c" the intercept is given by 'c' (and the gradient by 'm'):

3x + 3y = 9

⇒ x + y = 3

⇒ y = -x + 3

⇒ Intercept is 3

(And the gradient is -1)

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Q: What is the y-intercept of 3x plus 3y equals 9?
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