Question

Solve this problem2x-y2=13,x+y?

Answer 1

x+y)² = x²+y²+2xy (x+y)² = 13+2(6) (x+y)² = 13+12 (x+y)² = 25 (x+y) = √ 25 x+y = 5 (2) (x-y)² = x²+y²-2xy (x-y)² = 13-2(6 )