7.2. Proportion Properties http://www.ck12.org
Given the true proportion,^106 =^15 d =xyandd,x,andyare nonzero, determine if the following proportions are also
true.
11.^10 y=x 6
12.^1510 =d 6
13.^6 + 1010 =y+xx
14.^15 x=dy
For questions 15-18,AEED=CDBCandEDAD=CDDB=ECAB.
- FindDB.
- FindEC.
- FindCB.
- FindAD.
19.WritingExplain whya+bb=c+ddis a valid proportion. HINT: Cross-multiply and see if it equalsad=bc.
20.WritingExplain whya−bb=c−ddis a valid proportion. HINT: Cross-multiply and see if it equalsad=bc.