Respuesta :

calculista
we have that
t + u = 9 --------> t=9-u-----------> equation 1
9t – 9u = –9----------> equation 2

I substitute 1 in 2
9*[9-u]-9u=-9
81-9u-9u=-9
18u=81+9
18u=90
u=90/18---------> u=5
t=9-u------> t=9-5----> t=4

the answer is
u=5
t=4




zxmbified

Answer:

the answer is

u=5

t=4

Step-by-step explanation:

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