Question

The value of y varies directly with x, and y = −10 when x = 40. Identify the value of y when x = −5.

y = 0.25
y = 1.52
y = 1
y = 1.25

Answer 1

• y = 1.25

Explanation:

Direct variation:

• y = kx

With given points:

• -10 = k*40
• k = - 1/4

The value of y when x = -5

• y = -5*(-1/4)
• y = 1.25