Question #2520d

1 Answer
Oct 22, 2017

Answer:

#y=10#

Explanation:

#4/8=5/y#

Multiply both sides by #8#.

#color(red)cancel(color(black)(8))^1xx4/color(red)cancel(color(black)(8))^1=5/yxx8#

Simplify.

#4=40/y#

Multiply both sides by #y#.

#4y=40/color(red)cancel(color(black)(y))^1xxcolor(red)cancel(color(black)(y))^1#

Simplify.

#4y=40#

Divide both sides by #4#.

#y=40/4#

#y=10#

Check the proportions (ratios) on both sides of the equation.

#4/8=0.5#

#5/10=0.5#

#0.5=0.5#