Question

resolva a inequação {x+y=90° e x-y=60°}

Answer 1

x+y=90
x-y=60
x=60+y

x+y=90
60+y+y=90
2y=30
y=15

x+y=90
x+15=90
x=90-15
x=75

Answer 2

1 e o outro eh 2 :-)