Respuesta:
1.
x + y - 40 = 180
x + y = 220
2.
3y - 36 = 180
3y = 216
y = 72
4x + 72 - 52 = 180
4x + 20 = 180
4x = 160
x = 40
3.
25 + 2x + x + 5 = 90
3x + 30 = 90
3x = 60
x =20
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Respuesta:
1.
x + y - 40 = 180
x + y = 220
2.
3y - 36 = 180
3y = 216
y = 72
4x + 72 - 52 = 180
4x + 20 = 180
4x = 160
x = 40
3.
25 + 2x + x + 5 = 90
3x + 30 = 90
3x = 60
x =20