Substitution algebra 2. how do you do this

X=-2 and y=2 7
x
+
2
y
=
18
−
7
x
+
2
y
+
−
2
y
=
18
+
−
2
y
(Add -2y to both sides)
−
7
x
=
−
2
y
+
18
−
7
x
−
7
=
−
2
y
+
18
−
7
(Divide both sides by -7)
x
=
2
7
y
+
−
18
7

0
:
6
x
+
6
y
=
0
6
(
2
7
y
+
−
18
7
)
+
6
y
=
0
54
7
y
+
−
108
7
=
0
(Simplify both sides of the equation)
54
7
y
+
−
108
7
+
108
7
=
0
+
108
7
(Add 108/7 to both sides)
54
7
y
=
108
7
54
7
y
54
7
=
108
7
54
7
(Divide both sides by 54/7)

Sorry it came out like this!