X+y=180 degrees (being angles a straight line) Q. If x-y=40 degree then find the value of x and y

x, y. and 40 are the angles of a triangle.

x+y+40=180

x+y=140

difference between  x and y is 30.

x−y=30 (2)

2x=170

⇒x=85

Substitute this value n equation (2), we get

85−y=30

⇒y=85−30

⇒y=55

angles of a triangle are x=85, y=55 and 40.

Step-by-step explanation:

answer: y = -2.5x - 15

              (-6,0)

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.