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gushchina19522014
@gushchina19522014
July 2022
1
8
Report
Решите систему уравнений : 4x - y =9
3x + 7y = -1
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evatretakova0
{
4
x
−
y
=
9
3
x
+
7
y
=
−
1
⇒
{
y
=
4
x
−
9
3
x
+
7
y
=
−
1
⇒
{
y
=
4
x
−
9
3
x
+
7
(
4
x
−
9
)
=
−
1
⇒
{
y
=
4
x
−
9
31
x
−
62
=
0
⇒
{
y
=
4
x
−
9
x
=
2
⇒
{
y
=
−
1
x
=
2
Ответ:
x
=
2
;
y
=
−
1
0 votes
Thanks 0
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Answers & Comments
{
4
x
−
y
=
9
3
x
+
7
y
=
−
1
⇒
{
y
=
4
x
−
9
3
x
+
7
y
=
−
1
⇒
{
y
=
4
x
−
9
3
x
+
7
(
4
x
−
9
)
=
−
1
⇒
{
y
=
4
x
−
9
31
x
−
62
=
0
⇒
{
y
=
4
x
−
9
x
=
2
⇒
{
y
=
−
1
x
=
2
Ответ:
x
=
2
;
y
=
−
1