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Which point is the intersection of the lines (x+y=7) and (x-y=1) on a graph?

Answer and explanation

Correct answer: ((4,3))

The direct answer is option B: (4,3). To find the intersection, solve both equations together. Add x+y=7 and x-y=1: the y terms cancel, giving 2x=8. Divide by 2 to get x=4. Substitute into x+y=7: 4+y=7, so y=3. Therefore the common point is (4,3). B is correct because it satisfies both equations: 4+3=7 and 4-3=1. A, (3,4), satisfies the first equation, but 3-4=-1, not 1. C, (5,2), gives 5+2=7, but 5-2=3, not 1. D, (2,5), gives 2+5=7, but 2-5=-3, not 1. The intersection is the single point that lies on both lines, so checking both equations is a reliable method. Memory cue: add equations with opposite y signs, then substitute the found coordinate.

Related tags

Linear EquationsGraphical SolutionIntersection PointNumerical

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