</span></span></span><span><span><span><span>x^2</span>−19</span>−<span>x^2</span></span>=<span><span><span>x^2</span>−<span>4x</span></span>−<span>x^2</span></span></span><span>(Subtract x^2 from both sides)
</span><span><span>−19</span>=<span>−<span>4x</span></span></span> <span><span>−<span>4x</span></span>=<span>−19</span></span><span>(Flip the equation)
</span><span><span><span>−<span>4x</span></span><span>/−4</span></span>=<span><span>−19</span><span>/−4 </span></span></span>(Divide both sides by -4)<span>Answer. x=<span>19/4 </span></span><span>Check answers. (Plug them in to make sure they work.)</span>
Step-by-step explanation: Since the total number of games played in the graph is 12, if you half that and get six, you half the total number of wins as well and get 4. :]