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How are the lines y = 2x + 1 and y = 2x − 7 related?

Answer and explanation

Correct answer: Parallel

Answer: option A, parallel. In slope-intercept form y=mx+c, m is the slope and c is the y-intercept. For y=2x+1, the slope is 2 and the intercept is 1. For y=2x−7, the slope is also 2, but the intercept is −7. Two distinct lines with equal slopes have the same direction and are parallel. They are not the same line because their y-intercepts are different. They are not perpendicular: for non-vertical perpendicular lines, the product of their slopes is −1, whereas here 2×2=4. They do not intersect because equal slopes and unequal intercepts make the equations inconsistent when equated. Thus A is the only correct option. Memory cue: same slope plus different intercept means parallel; same slope plus same intercept means the same line.

Related tags

Straight-LinesSlopeParallel-LinesCoordinate-GeometryGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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