Is this a linear function?

Yes

Step-by-step explanation:

We will finde linear line trought two point and chak do the other two point hold in equation. If do, that is linear function.

Line trough two first points is:

(y-1)/(-2-1)=(x-3)/(-1-3)

Y-1=-3(x-3)/(-4)

See do other two points are in this equation ok.

X=7 y=4

4-1=3

-3*4/(-4)=3 it is ok

X=11 y=7

7-1=6

-3(11-3)/(-4)=3*8/4=6

It is ok too, so

this is linear function.

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w