Solve the simultaneous equations below using substitution.
\[
\begin{array}{r}
7 x-2 y=15 \\
y+6=2 x
\end{array}
\]
\(\boxed{(1, -4)}\)
Step 1 :From the second equation, we have $y = 2x - 6$
Step 2 :Substitute this expression for $y$ into the first equation: $7x - 2(2x - 6) = 15$
Step 3 :Simplify the equation: $7x - 4x + 12 = 15$
Step 4 :Combine like terms: $3x = 3$
Step 5 :Divide by 3: $x = 1$
Step 6 :Substitute $x = 1$ back into the expression for $y$: $y = 2(1) - 6$
Step 7 :Simplify: $y = -4$
Step 8 :\(\boxed{(1, -4)}\)