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What is the point of intersection of the lines \(y=4\) and \(2x+3y=22\) on a graph?

Answer and explanation

Correct answer: \((5,4)\)

Every point on the line \(y=4\) has y-coordinate 4. Substituting this into the other equation gives \(2x+3(4)=22\), so \(2x=10\) and \(x=5\). Therefore, the intersection point is \((5,4)\). Option B incorrectly swaps the x- and y-coordinates. Exam tip: for a horizontal line \(y=c\), the y-coordinate is fixed at \(c\).

Related tags

Pair Of Linear EquationsGraphical MethodIntersection PointHorizontal LineGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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