What is the slope of a line that is perpendicular to the line through the points A(-1,-2) and B(2,7)

-1/3

Step-by-step explanation:

the slope of this line

m=(y1-y2)/(x1-x2)

m=(7-(-2))/(2-(-1))

m=9/3=3 --> slope of the first line

in order to find the slope of the line that is perpendicular to this one we need to find the reciprocal of this (their products need to be equal to -1)

so the slope of the second line is (-1/3)

answer: when you burn wood, the carbon reacts with the oxygen in the air to create ash and smoke. that is a permanent change you cannot undo that.

step-by-step explanation:

< 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)