Question

Te wszystkie działania sią w klamrach {
x+3y=3
x-y=6

2x-y=10
x+5y=-17

3m+n=9
2m-5n=-11

4a-2=b
3a+7b=1,5

3x-2y=5
2x-y=4

2x+9y=-9
-3+3y=8

Answer 1

1)x+3y=3
x-y=6/*-1
x+3y=3
-x+y=-6
---------
4y=3/4
y=3
---
4
0.75+3y=3
3y=3-0.75/:3
y=0.75
2)2x-y=10
x+5y=-17/*-2
2x-y=10
-2x-10y=34
-----------------
-11y=44/-11
y=-4
3)3m-n=9/5
2m-5n=-11
15m-5n=45
2m-5n=-11
------------
17n=34/17
n=2
4)4a-2=b/*7
3a+7b=1.5
28a-14=7b
3a+7b=1.5
28a-7b=14
3a+7b=1.5
31a=15.5/31
a=0.5
5)3x-2y=5
2x-y=4/*-2
3x-2y=5
-4x+2y=-8
-x=-3/-1
x=3
6)2x+9y=-9
-3+3y=8/*-3
2x+9y=-9
9-9y=-24
-9y=9-24/:-9
y=5
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