Proszę o rozwiązanie tyvh dwóch równań:
1) 2x+5y=42
x+y=15
.
2) 1x+2y+56
x+y=34
2x+5y=42
x=15-y
2*(15-y)+5y=42
30-2y+5y=42
-2y+5y=42-30
3y=12 |:3
y=4
x=15-4
x=11
x+2y=56
x=34-y
34-y+2y=56
-y+2y=56-34
y=22
x=34-22
x=12
Licze na NAJ! :)
x+y=15 /*(-2)
-2x-2y=-30
3y=12
x+4=15
x+2y=56 /*(-1)
-x-2y=-56
-y=-22
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2x+5y=42
x+y=15
2x+5y=42
x=15-y
2*(15-y)+5y=42
x=15-y
30-2y+5y=42
x=15-y
-2y+5y=42-30
x=15-y
3y=12 |:3
x=15-y
y=4
x=15-4
y=4
x=11
x+2y=56
x+y=34
x+2y=56
x=34-y
34-y+2y=56
x=34-y
-y+2y=56-34
x=34-y
y=22
x=34-22
y=22
x=12
Licze na NAJ! :)
2x+5y=42
x+y=15 /*(-2)
2x+5y=42
-2x-2y=-30
3y=12
y=4
x+4=15
x=11
y=4
x+2y=56 /*(-1)
x+y=34
-x-2y=-56
x+y=34
-y=-22
y=22
x=12