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jerry:y
x+y=84
x+y=84-18
2x=66
x=66/2
x=33
R:jerry tiene 33 años y tom 51
Jerry = m
Resolvemos.
m - 18 + m = 84
m + m - 18 = 84
2m - 18 = 84
2m = 84 + 18
2m = 102
m = 102/2
m = 51
m - 18 = 51 - 18 = 33
Solución :
Jerry tiene = 33 años
Tom tiene = 51 años