Linear Functions

SAT Math· difficulty 3/5

Line \ell is perpendicular to the line y=25x+1y = \frac{2}{5}x + 1. What is the slope of \ell?

  • A

    52-\frac{5}{2}

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  • B

    25-\frac{2}{5}

  • C

    25\frac{2}{5}

  • D

    52\frac{5}{2}

Explanation

Perpendicular slopes are negative reciprocals: 12/5=52-\frac{1}{2/5} = -\frac{5}{2}.

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