Question

3х+у=1
2х-5у=-22


5х+у=24
7х+4у=18

помогите пожалуйста

Answer 1

1)$left { {{3x+y=1} atop {2x-5y=22}} right.$
$left { {{y=1-3x} atop {2x-5(1-3x)=22}} right.$
$left { {{y=1-3x} atop {2x-5+15x=22}} right.$
$left { {{y=1-3x} atop {17x-5=22}} right.$
$left { {{y=1-3x} atop {17x=27}} right.$
$left { {{y=1-3x} atop {x= frac{27}{17}}} right.$
$left { {{y=1-3frac{27}{17} } atop {x= frac{27}{17}}} right.$
$left { {{y=-3frac{10}{17} } atop {x= frac{27}{17}}} right.$

2) $left { {{5x+y=24} atop {7x+4y=18}} right.$
$left { {{y=24-5x} atop {7x+4(24-5x)=18}} right.$
$left { {{y=24-5x} atop {7x+96-20x)=18}} right.$
$left { {{y=24-5x} atop {-13x=-78}} right.$
$left { {{y=24-5x} atop {x=5}} right.$
-$left { {{y=24-5*6} atop {x=6}} right.$
$left { {{y=-6} atop {x=6}} right.$