Practice problem
If ab=cd\frac{a}{b}=\frac{c}{d}ba=dc (and a,b,c,d≠0a,b,c,d \neq 0a,b,c,d=0), which of the following is also true?
ad=cb\frac{a}{d}=\frac{c}{b}da=bc
da=cb\frac{d}{a}=\frac{c}{b}ad=bc
ba=cd\frac{b}{a}=\frac{c}{d}ab=dc
ac=bd\frac{a}{c}=\frac{b}{d}ca=db
Type a concept, like “slope” or “photosynthesis”.
