5. Given the same figure at the right, if MN = x-2, and BC = x + 10 then BC =
obin
092
A. 12 units
C. 24 units
B. 14 units
D. 42 units
​

i dont get it. where are the "descriptions"?

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.

add -60 to 120 which will result in : 2x+3y=180

then subtract 2x: 3y=-2x+180

lastly, divide by 2: y= -2/3x+60

hope this is the answer you're looking for: )