Question

Is the line y=3x-7 parallel or perpendicular to 3x+9y=
9?Explain your answer

Answer 1

The lines are perpendicular.

Perpendicular lines have opposite reciprocal slopes.

Opposite reciprocals have a product of –1.

The given line has a slope of 3, and the second line has a slope of –1/3.

Explanation:

Answer 2

yes, perpendicular

Explanation:

perpendicular lines on a graph has opposite reciprocal slope

y=3x-7

3x+9y=9 ( put the equation in the slope intercept form y=mx+b

9y=-3x+9

y=-3x/9+9

y=-1/3 x +9

the slope of the first question is 3

the slope of the second equation is -1/3 x

yes the two lines are perpendicular