estefanylop estefanylop

10-11-2020
Mathematics

contestada

Solve.
3
b=-a
a + b = 21

Respuesta :

noursyam2013 noursyam2013

11-11-2020

Answer:b=-10.5, a=31.5

Step-by-step explanation: 3b=-a , -3b=a

a+b =21

-3b+b = 21

-2b=21

b=-10.5

a=-3b

a=-3*-10.5=31.5

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