Solving by the substitution method:
2y - 5 = 0
x = y + 10
2y = 5
y = x - 10
-> 2 (x-10) = 5
-> 2x -20 = 5
-> 2x = 20 + 5
-> 2x = 25
-> x = 25/2
Or
-> x = 12.5
y = x - 10
-> y = 12,5 - 10
-> y = 2.5
Or
-> y = 25/2 - 10/1
-> y = 25/2 - 10/1 x(2)
-> y = (25 - 20)/2
-> y = 5/2
Answer: X = 25/2, Y = 5/2
or X = 12.5, Y = 2.5 .
