решите систему:
x+y=4
3х -2у=17
х=4-y
3(4-y)-2y=17
12-3y-2y=17
-5y=17-12
-5y=5
y=-1
x=4-(-1)=5
x + y = 4 x = 4 - y y = -1 y = -1
3x - 2y = 17 3 (4-y) - 2y = 17 x = 4 - (-1) x = 5
3(4 - y) - 2y = 17
12 - 3y - 2y = 17
- 5y = 17 - 12
- 5y = 5
y = -1
(5; -1)
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Verified answer
х=4-y
3(4-y)-2y=17
12-3y-2y=17
-5y=17-12
-5y=5
y=-1
x=4-(-1)=5
Verified answer
x + y = 4 x = 4 - y y = -1 y = -1
3x - 2y = 17 3 (4-y) - 2y = 17 x = 4 - (-1) x = 5
3(4 - y) - 2y = 17
12 - 3y - 2y = 17
- 5y = 17 - 12
- 5y = 5
y = -1
(5; -1)