If y = -1, what is - 3y - 9 equivalent to?

-6

Step-by-step explanation:

Plug in (-1) for y: -3(-1) - 9

Simplify: Negative x Negative = Positive

-3(-1) = 3 so... 3-9

3 - 9 = -6

-3y - 9 is equivalent to -6

Step-by-step explanation:

-3(-1)-9

3-9=-6

-6≠-9

-6 is not equivalent to -9

< xcy ≅ < xby

step-by-step explanation:

in δcax and δbax,

so, δcax ≅ δbax (side-angle-side or sas)

since δcax ≅ δbax, we can conclude < acx ≅ < abx

in δacy and δaby,

so, δacy ≅ δaby (side-angle-side or sas)

since δacy ≅ δaby, we can conclude < acy ≅ < aby

now,

< acy ≅ < aby

=> < acx + < xcy ≅ < abx + < xby

=> < acx + < xcy ≅ < acx + < xby   (since < acx ≅ < abx already proved above)

subtracting < acx from both sides, we get

< acx + < xcy -< acx ≅ < acx + < xby -< acx

cancelling out < acx and -< acx from both sides, we get

< xcy ≅ < xby (proved)