Pomocy !!
Zadanie 5 strona 99 matematyka z plusem . Rozwiąż układ równań :
a) x+3y = 3
x - y = 5
b) 2x - y = 10
x+5y = -17
c) 3m +n = 9
2m - 5n = -11
d) 4a - 2 =b
3a +7b = 1,5
e) 5x = 4 - 2y
4x + y =
f) 6x - 3y = 9
x +5y = - 9,5
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a)x+3y=3
x-y=5
x+3y=3
x=5+y
5+y+3y=3
x=5+y
4y=3-5
x=5+y
4y=-2
x=5+y
y=-0,5
x=5-0,5
y=-0,5
x=4,5
b) 2x - y = 10
x+5y = -17 /*-2
2x-y=10
2x+10y=-34
2x-y-2x-10y=10+34
11y=44
y=4
2x-y=10
2x-4=10
2x=6
x=3