27-11-2018
Mathematics

contestada

a=4b-15 a and b have to add up to 90 so whats the answer?

Respuesta :

TheAronDavies TheAronDavies

27-11-2018

Step-by-step explanation:

a+b=90

a = 90-b

Therefore, 90-b = 4b - 15

90+15 = 4b + b

105 = 5b

b = 21

substitute b in and get, 4(21)-15 = 69

a=69 and b=21

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