Question 964716
Multiply the first equation by 3, the second by 5, and add them together,
{{{6c+15d+25c-15d=42+20}}}
{{{31c=62}}}
{{{c=2}}}
Then use either equation,
{{{5(2)-3d=4}}}
{{{10-3d=4}}}
{{{-3d=-6}}}
{{{d=2}}}