−7x−6y=4 x=−3y+8 solve for x and y me asap

-7x - 6y = 4      and      x = -3y + 8

so:

    -7(-3y+8) - 6y = 4

    21y - 56 - 6y = 4

        15y = 4 + 56

        15y = 60

          y = 4    

x = -3y + 8

x = -3•4 + 8

x = -12 + 8

x = -4

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.

you need to rotate this triangle about the origin 270 degrees clockwise to create the full square.