If y varies directly with x, and y = 2 when x = −4, what is the value of y when x = 20 ?
2 answers:
Answer:
y=kx
2=k.-4
k=-1/2
then
y=-1/2×20
y=-10
Answer:
y = - 10
Step-by-step explanation:
Given that y varies directly with x then the equation relating them is
y = kx ← k is the constant of variation
To find k use the condition y = 2 when x = - 4, that is
2 = - 4k ( divide both sides by - 4 )
= k, that is
k = - 
y = -
x ← equation of variation
When x = 20, then
y = -
× 20 = - 10
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