Answer:
the slopes 3 and -1/3 are negative reciprocals of each other...therefore, ur lines are perpendicular
Step-by-step explanation:
y = 3x - 7...slope here is 3 and y int is -7
3x + 9y = 9
9y = -3x + 9
y = -1/3x + 1....slope here is -1/3 and y int is 1
brainliest :)
