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AB = DE = y
AC - CE = AC - CE
y + 7 - (4 + y) = 4x - 3x
y + 7 - 4 - y = x
3 = x
8. Calcular x:
AM = ME = y
AC - CE = 20
y + x - (y - x) = 20
y + x - y + x = 20
2x = 20
x = 10
9. Calcular x:
BM = MC = y
AB + AC = 40
(x - y) + (x + y) = 40
2x = 40
x = 20
10. Calcular x:
AD = 42
AB = y
BC = x
CD = z
15 +z = 42 30 + y = 42 x + y + z = 42
z = 27 y = 12 x + 12 + 27 = 42
x + 39 = 42
x = 3