Tell whether the equation −2x + 4y = 5 represents a direct variation. if so, identify the constant of variation.

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?