A physicist is asked to analyze two mystery metals. Each metal is struck by light with three different wavelengths: $300nm,400nm,$ and $500nm.$ In each case, the physicist adjusts the voltage gradient to determine the energies of the emitted electrons. The results are shown in the chart below. What are the values of $x$ and $Y?$

$\backslash$table$[[$Wavelength$,$Mystery Metal A$,$Mystery Metal B$],[300nm,2\mathrm{.}9eV,1\mathrm{.}8eV$