Answer two questions about Systems
A
AA and
B
BB:
System
A
AA
start text, end text System
B
BB
{
x
−
4
y
=
1
5
x
+
6
y
=
−
5

⎩
⎪
⎪
⎨
⎪
⎪
⎧
​

x−4y=1
5x+6y=−5
​

{
x
=
1
+
4
y
5
x
+
6
y
=
−
5

⎩
⎪
⎪
⎨
⎪
⎪
⎧
​

x=1+4y
5x+6y=−5
​

1) How can we get System
B
BB from System
A
AA?