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At which point does the line \(6x-7y=42\) intersect the line \(x=0\)?

Answer and explanation

Correct answer: Point \((0,-6)\)

The line \(x=0\) represents the y-axis, so substitute \(x=0\) into the first equation: \(6(0)-7y=42\), giving \(-7y=42\) and hence \(y=-6\). Therefore, the intersection point is \((0,-6)\). Option A has the wrong sign for the y-coordinate, while option C is the x-intercept of the first line and does not lie on \(x=0\). Exam tip: when \(x=0\), the first coordinate of the point must be zero.

Related tags

Graphical MethodY-Axis IntersectionLinear EquationsCoordinate GeometryGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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