Question

решите систему уравнений номер 5

Answer 1

40х+3у=-10
20х-7у=-5 | *(-2)

40х+3у=-10
-40х+14у=10
+ -------------------
17y = 0
y= 0

20x = -5
x = -1/4

Answer 2

40x+3y=-11
20x-7y=-5|*-2
40x+3y=-11
-40x+14y=-10
17y=-21
y=2117
y=1,27
40x+3*1,27=-11
40x+3,81=-11
40x=-11-3,81
40x=-14,81
x=-14,8140
x=-0,37