21 Given equations A and B as
*x+y=12 and v-
y-x=6. respectively, which expression will eliminate the variable
OA ABB
OC A + 25
OD. A-s
OE 25 A
10
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step-by-step explanation:

ddd

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.

i think da answer is

d.square root of 3