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a - b = 20
Se anulan las b y te queda :
2a = 240
a = 120
a + b = 220
120 + b = 220
b = 220 - 120
b = 100
Suerte.
120+100=220 120-100=20
1 x+y=220
2 x-y=20
Despejamos ecuacion 1
y=220-x
Sustituimos por ecuacion 2
x-(220-x) =20
x-220+x =20
2x = 20+220
x = 240/2
Sustituimos en la ecuacion 1
120+y=220
Y=220-120
Y=100