Question

Ecuacion 1: x+y=72
Ecuacion 2: y=2/7x

Answer 1

x + y = 72
y = 2x/7

Entonces:

x + 2x/7 = 72
(7x + 2x)/7 = 72
9x/7 = 72
9x = 72.7
x = (72.7)/9
x = 8.7
x = 56

y = 2x/7
y = (2.56)/7
y = 2.8
y = 16


Rpta: x = 56 , y = 16