Solve by substitution or elimination
{
x
−
3
y
=
−
4
−
4
x
+
5
y
=
23
\displaystyle {\left\lbrace\begin{array}{ccccc} {x}&-&{3}{y}&=&-{4}\\-{4}{x}&+&{5}{y}&=&{23}\end{array}\right.}
{
x
−
4
x
−
+
3
y
5
y
=
=
−
4
23
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