calculus
posted by june .
Suppose that x=x(t) and y=y(t) are both functions of t. If x^2+y^2=26 and dx/dt=−2 when x=1 and y=5, what is dy/dt?
help??????

differentiate implicitly
2x dx/dt + 2y dy/dt = 0
sub in the values
2(1)(2) + 2(5)dy/dt = 0
dy/dt = 4/10  2/5