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What is the y-intercept of 3x + y = 18?

Answer and explanation

Correct answer: (0, 18)

The governing concept is the y-intercept of a graph. The y-intercept is the point where a line crosses the y-axis, and every point on the y-axis has x-coordinate 0. Substituting x = 0 into 3x + y = 18 gives 3(0) + y = 18, so y = 18. Therefore the y-intercept is (0,18), making option C correct. Option A is the x-intercept, obtained by setting y = 0. Option B incorrectly treats the coefficient 3 as an intercept, while option D has the correct zero x-coordinate but an incorrect y-value. The distinction between x = 0 for the y-axis and y = 0 for the x-axis is essential.

Related tags

Y-InterceptAxis InterceptsGraphical MethodLinear EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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