Question 61633
Cross Multiply ({{{a/b=c/d}}} is {{{ad=bc}}}
{{{-5/c=1/3}}}
-5(3)=c(1)
{{{highlight(-15=c)}}}
:
{{{-6/13=8/(x+1)}}}
-6(x+1)=8(13)
-6x-6=104
-6x-6+6=104+6
-6x=110
{{{-6x/-6=110/-6}}}
{{{highlight(x=-55/3)}}}
:
{{{(r+2)/7=5/7}}}
7(r+2)=7(5)
{{{7r+14=35}}}
{{{7r+14-14=35-14}}}
{{{7r=21}}}
{{{7r/7=21/7}}}
{{{highlight(r=3)}}}
Happy Calculating!!!