Could you guys help me?

I'll do each section below

Step-by-step explanation:

First question = 15

I'm going to assume that P and Q are equal so your equation would be:

8x+4 = 124

(-4 from both sides) => 8x = 120

(divide by 8 both sides) => x=15

Second question = 129

Angles on a straight line = 180 so your equation is:

5x+4+2x+1 = 180

(simplify) 7x+5 = 180

(-5) 7x = 175

(divide by 7) x = 25

Now since you are finding the obtuse angle you substitute this into 5x+4 and you should get 129

Third question = angle y

Adjacent just means next to so in this case the angle next to angle z is angle y

Hope this all helped, have a great day! :)

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1