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Grazes
 3 years ago
If a+b=140 and ar+br=35. What is the value of r?
Grazes
 3 years ago
If a+b=140 and ar+br=35. What is the value of r?

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ktg1006
 3 years ago
Best ResponseYou've already chosen the best response.1First this you need to do is solve for r ar+br=35 r(a+b)=35 r=35/(a+b)

ktg1006
 3 years ago
Best ResponseYou've already chosen the best response.1The next thing is use substitution so you only have one variable a+b=140 a=140b

Grazes
 3 years ago
Best ResponseYou've already chosen the best response.0I didn't think of turning r into terms of ab. Thanks!

ktg1006
 3 years ago
Best ResponseYou've already chosen the best response.1Then substitute 140b in the equation you solved for r r=35/((140b)+b) r=35/140
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