What is the justification for the step taken from line 2 to line 3? 5 lines of math. the first line has, 3 x plus 9 minus 7 x equals x plus 10 plus x. the second line has, negative 4 x plus 9 equals 2 x plus 10. an arrow pointing from the front of the second line to the front of the third line. the third line has, negative 6 x plus 9 equals 10. the fourth line has, negative 6 x equals 1. the last line has x equals negative startfraction 1 over 6 endfraction. the subtraction property of equality the multiplication property of equality combining like terms on one side of the equation the distributive property

The subtraction property of equality

Step-by-step explanation:

it just is

stethere all not eveanp-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)