I don’t understand how to do this.

side RQ = 6.99802

Side NR = 4.00061

Step-by-step explanation:

Look at the picture below: see how I solved all angles:

You already know all angles in triangle NRQ and side NQ = 8

NR = NQ*sin(30)/sin(89)

NR = 8*sin(30)/sin(89) = 4.00061

side RQ = NQ*sin(61)/sin(89)

side RQ = 8*sin(61)/sin(89) = 6.99802

IF YOU LIKE GIVE BRAINLIEST

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