Question 373873
1.{{{A+C=90}}}
2.{{{A+(1/2)C=71}}}
Subtract eq. 2 from eq. 1,
{{{A+C-A-(1/2)C=90-71}}}
{{{(1/2)C=19}}}
{{{highlight(C=38)}}}degrees
Then from eq. 1,
{{{A+38=90}}}
{{{highlight(A=52)}}}degrees