Whats the value of b?

b = 5

Step-by-step explanation:

This triangle is a 30 - 60 - 90 special right triangle

As you can see in the image provided below the longer leg is equal to the short leg times √3

This means that the short leg is equal to the long leg divided by √3

Thus, b = which is equivalent to 5

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