Direct proportion for beginners

What is the direct proportion equation for the following information. x = 12, y = 16

• y = 16/12 x

• k = 16/12

• 16 = k(12)

• y = kx

Y varies directly as x. If y = 39 when x = 52, what is the best answer for k?

• k = 3/4

• k = 39/52

• k = 52

• k = 4/3

If x = 9 when y = 30, what is k equal to

• k = 3/1

• k = 1/3

• k = 10/3

• k = 3/10

Upon seeing, "y varies directly as x" we immediately.....

• write down what k is equal to

• write down what x and y are

• write y = kx

• substitute into the equation

What is the value of k in the following equation? y = 2/7 x

• 2

• 7

• 2/7

• 7/2

Which equation is not an example of direct proportion?

• y = 3x

• y = 2/3 x + 5

• y = x

• y = - 6x

Which equation shows a direct proportion?

• x = 6

• y = 5x - 2

• y = 3/4 x

• y - x = 4

n varies directly with c. If c = 24 when n = 18, what is the equation of direct proportion

• n = kc

• n = 18/24 c

• k = 18/24

• n = 3/4 c

The equation y = kx refers to which algebraic concept?

• direct equality

• direct variation

• linear equation

• direct proportion

In a direct variation, y = 39 when x = 3. Find the equation of direct proportion

• y = kx

• y = 13 x

• y = 1/13 x

• k = 13