math 3 5
(
1
0
0
0
1
0
0
0
1
)
(2.1)
E
=
m
⁢
c
2
8.44
⁢
x
+
55
⁢
y
=
0
3.1
⁢
x
-
0.7
⁢
y
=
-
1.1