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alisa581
@alisa581
July 2022
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Evgexa300
X+5y=7|*(-3)
3x+2y=-5
-3x-15y=-21
3x+2y=-5
+
_____________
1)-13y=-26
y=-26:(-13)
y=2
2)3x+2y=-5
3x+4=-5
3x=-9
x=-9:3
x=-3
Ответ:х=-3; у=2
0 votes
Thanks 1
alisa581
Спасибо
alyssa61
X=7-5y
3 * (7-5y) + 2y=-5
21-15y+2y=-5
21-13y=-5
13y = 21+5
13y=26
y=2
x+5*2=7
x+10=7
x=-3
(-3 :2)
0 votes
Thanks 1
alisa581
Спасибо
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Answers & Comments
3x+2y=-5
-3x-15y=-21
3x+2y=-5
+
_____________
1)-13y=-26
y=-26:(-13)
y=2
2)3x+2y=-5
3x+4=-5
3x=-9
x=-9:3
x=-3
Ответ:х=-3; у=2
3 * (7-5y) + 2y=-5
21-15y+2y=-5
21-13y=-5
13y = 21+5
13y=26
y=2
x+5*2=7
x+10=7
x=-3
(-3 :2)