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What is the value of x in the equation x – y = 30, when y = 15?

 Jun 17, 2015

Best Answer 

 #2
avatar+33654 
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Careful Anonymous; you've gone wrong in the third line. 

This should be:

x = 30 + 15

so x = 45

.

 Jun 17, 2015
 #1
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hi,

this problem is a simple substitution.

so you know that y = 15, so substitute it into the equation you were given!

xy=30

x15=30

so now with 15 substituted in, all you have to do is move the 15 over to the other side!

x=3015

and now simplify by subtracting 15 from 30!

x=15

hope this helps!

 Jun 17, 2015
 #2
avatar+33654 
+10
Best Answer

Careful Anonymous; you've gone wrong in the third line. 

This should be:

x = 30 + 15

so x = 45

.

Alan Jun 17, 2015

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