11. cos theta = 3/4, in quadrant 1

Step-by-step explanation:sin

(

t

h

e

t

a

)

=

√

7

4

cos

(

t

h

e

t

a

)

=

3

4

tan

(

t

h

e

t

a

)

=

√

7

3

cot

(

t

h

e

t

a

)

=

3

√

7

7

sec

(

t

h

e

t

a

)

=

4

3

csc

(

t

h

e

t

a

)

=

4

√

7

7

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