Solve the system using substitution.
{
3
x
+
y
=
13
−
8
x
+
4
y
=
−
68
\displaystyle {\left\lbrace\begin{array}{c} {3}{x}+{y}={13}\\-{8}{x}+{4}{y}=-{68}\end{array}\right.}
{
3
x
+
y
=
13
−
8
x
+
4
y
=
−
68
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