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At which point do the lines \(3x+2y=22\) and \(x+2y=10\) meet on the graph?

Answer and explanation

Correct answer: Point \(\left(6,2\right)\)

The direct answer is A: (6,2). Subtract the second equation from the first: (3x+2y)−(x+2y)=22−10. This gives 2x=12, so x=6. Substitute x=6 into x+2y=10: 6+2y=10, hence 2y=4 and y=2. The lines therefore meet at (6,2). Verify it in both equations: 3(6)+2(2)=18+4=22 and 6+2(2)=10. A is correct. B, (2,6), gives 18 in the first equation and 14 in the second, so it fails both. C, (5,3), gives 21 in the first and 11 in the second, so it fails both. D, (4,4), gives 20 in the first and 12 in the second, so it also fails both. The graphical intersection is the ordered pair satisfying both equations simultaneously. Always substitute the answer back into both equations, because a point satisfying only one line is not the solution of the pair. Memory cue: eliminate one variable, solve the other, substitute back.

Related tags

IntersectionSubtraction MethodGraphical Solution

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