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What is the intersection point when the lines (3x+y=15) and (x-y=1) are graphed?

Answer and explanation

Correct answer: ((4,3))

The direct answer is option B, (4,3). A graph intersection must satisfy both equations. From x-y=1, add y to both sides to get x=y+1, or y=x-1. Substitute y=x-1 into 3x+y=15: 3x+(x-1)=15, so 4x-1=15, 4x=16, and x=4. Then y=x-1=3. Thus the lines meet at (4,3). Option A, (3,4), gives 3(3)+4=13 rather than 15, although it gives 3-4=-1 rather than 1 in the second equation. Option B gives 3(4)+3=15 and 4-3=1, so it is correct. Option C, (5,0), satisfies the first equation but gives 5 instead of 1 in the second. Option D, (2,5), satisfies neither equation: 11 is not 15 and -3 is not 1. Memory cue: the intersection point must pass both substitution checks.

Related tags

Linear EquationsGraphical SolutionIntersectionNumerical

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