Question #2520d

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Answer 1 · 2017-10-22T08:58:19

$y = 10$ $y=10$

$\frac{4}{8} = \frac{5}{y}$ $4/8=5/y$

Multiply both sides by $8$ $8$ .

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

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.

$4/8=0.5$

$5/10=0.5$

$0.5=0.5$