Given the following equations:

$4x+7y=15$

$5x-5y=-6$

Solve for y$.($Record your answer rounded to $2$ decimal places; for example, record $18\mathrm{.}3498$ as $18\mathrm{.}35).$

Referring back to the prior problem, what is $x?($Record your answer rounded to $2$ decimal places; for example, record $18\mathrm{.}3498$ as $18\mathrm{.}35).$