1
.
Two
equations
in
two
variables
are
called
____________________
____________________
____________________
.
2
.
If
a
system
of
equations
doesn't
have
solutions
,
the
lines
are
____________________
.
3
.
If
a
system
of
equations
has
infinite
solutions
,
the
lines
are
____________________
____________________
.
4
.
Two
____________________
lines
has
____________________
solution
and
their
____________________
are
____________________
with
opposite
sign
.
5
.
Two
____________________
lines
has
____________________
____________________
and
their
____________________
are
____________________
.
