maryamdashti98 maryamdashti98

21-10-2017
Mathematics

contestada

rewrite the equation in the form y= k/x

xy= -45

x= 15/y

2xy=9

what are the answers and how do i solve them?

Respuesta :

ejelonubenedict ejelonubenedict

21-10-2017

1.
xy=-45 (divide both sides by x)
xy÷x = 45÷x
y= 45÷x
y= 45/x

2.
x=15/y ( cross multiply)
xy= 15 ( divide both sides by x)
y= 15/x

3.
2xy= 9 (divide both sides by 2x)
y= 9/2x
y= 4.5/x

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