How do you use cross products to solve #30/6=b/7#?

2 Answers
Apr 11, 2018

Answer:

#b = 35#

Explanation:

eliminate the denominators so that you can get an idea as to what b will become

#30/6 = b/7# cross multiply the denominators by the other numerators

#30(7) = b(6)#

#210 = 6b# divide both sides by 6 to isolate b

#b = 35#

a faster way to do this is by seeing that #30/6# equals #5/1#. take that #5# and multiply it by #7# to get #35#

Apr 11, 2018

Answer:

#b=35#

Explanation:

#"given equal fractions "a/b=c/d#

#"then "ad=bclarrcolor(blue)"cross product"#

#"using this method to solve the equation"#

#rArr6b=(30xx7)#

#rArrb=(30xx7)/6=35#