Solve the system with the addition method:
{
−
8
x
−
7
y
=
−
15
−
8
x
+
4
y
=
−
92
\displaystyle {\left\lbrace\begin{array}{ccc} -{8}{x}-{7}{y}&=&-{15}\\-{8}{x}+{4}{y}&=&-{92}\end{array}\right.}
{
−
8
x
−
7
y
−
8
x
+
4
y
=
=
−
15
−
92
Answer: (
,
)
Enter your answers as integers or as reduced fraction(s) in the form A/B.
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