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If the points \\((-1,7)\\) and \\( (2,1)\\) are included in a value table of a line, which is the correct equation of the line?

Answer and explanation

Correct answer: \\(2x+y=5\\)

Substitute both points into the options. For \\((-1,7)\\), \\(2(-1)+7=5\\), and for \\( (2,1)\\), \\(2(2)+1=5\\). Thus both points satisfy \\(2x+y=5\\). Alternatively, the slope is \\(m=(1-7)/(2-(-1))=-2\\), giving \\(y=-2x+5\\), or \\(2x+y=5\\). Exam tip: To verify a line equation, substitute both given points and check that each one satisfies it.

Related tags

Value TableLine EquationGraphical MethodCoordinate GeometryLinear EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two Variables

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