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What is the graphical solution, that is, the point of intersection, of the lines \(y=-1\) and \(2x-y=9\)?

Answer and explanation

Correct answer: (4, -1)

On the first line, \(y=-1\). Substituting this in the second equation gives \(2x-(-1)=9\), or \(2x+1=9\), so \(x=4\). Therefore, the point of intersection is \((4,-1)\). In option B the coordinates are reversed, while options C and D have an incorrect \(x\)-value or \(y\)-value, respectively. Exam tip: For a horizontal line of the form \(y=\text{constant}\), the y-coordinate of the intersection is known immediately.

Related tags

Pair Of Linear EquationsGraphical MethodPoint Of IntersectionHorizontal LineGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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