-1 -1 | -12
-3 2 | 32
How would you put this into row echelon form ?

Multiply through row 1 by -1:

Add 3(row 1) to row 3:

Multiply through row 2 by 1/5:

Add -1(row 2) to row 1:

honesty mood

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.