An equation is called an identity if it is valid for value(s) of the variable. The equation
2x = x + x
is an algebraic identity, and the equation
sin2(x) + cos2(x) =
is a trigonometric identity.

Suppose that x and y are both differentiable functions of t and are related by the given equation. use implicit differentiation with respect to t to determine startfraction dy over dt endfraction in terms of x, y, and startfraction dx over dt endfraction .

The table shows the results of three plays in a football game. what is the net result of the three plays? football game 1st play 5 yards 2nd play -9 yards 3rd play 12 yards

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2