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At which point do the lines (2x+3y=12) and (x+y=5) meet on the graph?

Answer and explanation

Correct answer: ( (3,2) )

Direct answer: option A, (3,2). The graphical solution of two linear equations is the common point satisfying both equations. Test the coordinates x=3 and y=2 in the first equation: 2x+3y=2(3)+3(2)=6+6=12. Test them in the second: x+y=3+2=5. Both equations are true, so their graphs meet at (3,2). Option A works. Option B, (2,3), gives 2(2)+3(3)=13, not 12, so it fails the first equation. Option C, (4,1), gives 2(4)+3(1)=11, so it fails the first equation. Option D, (1,4), gives 14 in the first equation and also does not give 5 in the second. Thus only A is the intersection. Memory cue: a graph intersection must pass both substitution checks.

Related tags

Graphical MethodIntersectionLinear Equations

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