If two lines have slopes of -2/9 and 9/2 are they perpendicular?

Step-by-step explanation:

If the two lines are perpendicular, Multiplying their slopes must give the result of -1.

=>

=> -1

Since, the result of multiplying these slopes give -1, So, the two lines are perpendicular.

answer: .75 km

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18