Question

84. Are the lines y = -x – 10 and 5x + 5y = 10 perpendicular? Explain.A. No; their slopes are not opposite reciprocals.B. No; their slopes are not equalC. Yes, their slopes have product -1.D. Yes, their slopes are equal.

Answer 1

For y = -x – 10

Slope m = -1

For 5x + 5y = 10

y = (-5x +10) / 5 = -x + 2

Slope m = -5/5 = -1

Then after looking choice options

Answer IS

OPTION D ) Their slopes are equal