Which body system of a pregnant woman undergoes the most dramatic physiological changes during pregnancy?

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

i think the answer would d

multiplying and dividing the two decimals and the eqations by the same number of the overalls