Plug into y-y1=m(x-x1)
y+4=4(x-4)
Answer:
see explanation
Step-by-step explanation:
Given that M is directly proportional to r³ then the equation relating them is
M = kr³ ← k is the constant of proportion
To find k use the condition when r = 4, M = 160, thus
160 = k × 4³ = 64k ( divide both sides by 64 )
2.5 = k
M = 2.5r³ ← equation of variation
(a)
When r = 2, then
M = 2.5 × 2³ = 2.5 × 8 = 20
(b)
When M = 540, then
540 = 2.5r³ ( divide both sides by 2.5 )_
216 = r³ ( take the cube root of both sides )
r =
= 6
Answer:
B
Step-by-step explanation:
The answer is B, -12.
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-12^2 --> -144
-144+144 = 0
Therefore, the answer is B, -12.
I earned 5 for x and 12 for y but I'm not sure about the «y»