Solve the system by substitution. \[ \begin{array}{l} y=-7 x+3 \\ y=-8 x \end{array} \]

Step 1 ：1. \(y = -8x\)

Step 2 ：2. Substitute \(-8x\) for \(y\) in first equation: \(-8x = -7x + 3\)

Step 3 ：3. Solve for \(x\): \(x = 1\)

Step 4 ：4. Substitute \(1\) for \(x\) in second equation: \(y = -8(1)\)

Step 5 ：5. Solve for \(y\): \(y = -5\)