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4 (x-y)=600 (2)
(1)
(x+y)=850×2
x+y=1700
x=1700 - y
sustituir X en la ecuación (2)
(2)
4 (1700 - y -y)=600
4 (1700 - 2y )=600
6800-8y=600
-8y=600-6800
-8y=-6200
y= - 6200÷ -8
y= 775
sustituir y en la ecuación (1)
(x+775)÷2= 850
x+775= 850 × 2
x+775=1700
x=1700 - 775
x= 925
R/ Los números son 775 y 925