Let's simplify step-by-step.<span><span><span>3y</span>−4</span>−<span>5y</span></span><span>=<span><span><span><span><span>3y</span>+</span>−4</span>+</span>−<span>5y</span></span></span>Combine Like Terms:<span>=<span><span><span>3y</span>+<span>−4</span></span>+<span>−<span>5y</span></span></span></span><span>=<span><span>(<span><span>3y</span>+<span>−<span>5y</span></span></span>)</span>+<span>(<span>−4</span>)</span></span></span><span>=<span><span>−<span>2y</span></span>+<span>−<span>4</span></span></span></span>