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What is the x-intercept of x + y = 9?

Answer and explanation

Correct answer: (9, 0)

The governing concept is the coordinate condition for an x-intercept. A line meets the x-axis at a point whose y-coordinate is 0. Substitute y = 0 into x + y = 9: x + 0 = 9, so x = 9. Hence the x-intercept is (9, 0), and option A is correct. Option B is the y-intercept because its x-coordinate is 0. The points (1, 8) and (4, 5) do satisfy the equation, since their coordinate sums are 9, but neither lies on the x-axis: their y-coordinates are 8 and 5 rather than 0. This illustrates that merely satisfying the equation is not enough; an x-intercept must also lie on the x-axis.

Related tags

X-InterceptCoordinate GeometryLinear EquationGraphical MethodMathematicsClass 10 McqGraphical Method Of Finding Solutions.Graphical Method Of Finding Solutions

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