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After a flood, the depth of water was measured as it fell. The graph below shows the changes in depth
D
t
What is the equation of the depth of water (D) over time (t) ?
m=-3/6 = -1/2
D-intercept: 3
D= -1/2 t+3 =
If the pressure (P) varies inversely with volume (V), which formula correctly expresses P in terms of V and k, where k is a constant?
P=k/V
It is known that y varies directly with the cube of x. When x = 3, y=648. What is the equation connecting x and y?
y = kx^3
648 = k x 3^3
k = 648/27
k = 24
y = 24x^3
The equation of the line drawn below could be:
Positive gradient
Negative y-intercept
y=-4+2x
Which of the following equations could describe the relationship between x and y, graphed below?
y
x
y=5/x