Question

Se (x+y=10
(X-y=7 de o valor numerico de:2x + 3y

Answer 1

x  + y = 10 
x - y = 7


x = 10 - y 

10 - y - y = 7 

- 2y = 7 - 10

- 2y = - 3  (-1)

y = 3/2

x - y = 7    x - 3/2 = 7    x = 7 + 3/2   x = 17/2

S = {17/2, 3/2}

2x + 3y = 

2.17/2 + 3.3/2 = 

17 + 9/2 =

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