Answer
$x \approx 19.1$
$x \approx 14.5$
Work Step by Step
First, let's find the measure of the third angle by using the triangle sum theorem:
$m$ of third angle = $180 - (63 + 71)$
Evaluate what is in parentheses first:
$m$ of third angle = $180 - (134)$
Subtract:
$m$ of third angle = $46^{\circ}$
Now, we can use the law of sines to relate the three angles and sides to one another:
$\frac{sin 63^{\circ}}{18} = \frac{sin 71^{\circ}}{x} = \frac{sin 46^{\circ}}{y}$
Let's just use the first two fractions to find the value of $x$:
$\frac{sin 63^{\circ}}{18} = \frac{sin 71^{\circ}}{x}$
Multiply each side by $x$:
$\frac{sin 63^{\circ}}{18}(x)$ = sin $71^{\circ}$
Divide each side of the equation by $\frac{sin 63^{\circ}}{18}$ to solve for $x$:
$x \approx 19.1$
Now, let's turn our attention to $y$:
$\frac{sin 63^{\circ}}{18} = \frac{sin 46^{\circ}}{y}$
Multiply each side by $y$:
$\frac{sin 63^{\circ}}{18}(y)$ = sin $46^{\circ}$
Divide each side of the equation by $\frac{sin 63^{\circ}}{18}$ to solve for $x$:
$x \approx 14.5$
