garzamatt7
01.07.2019 •
Mathematics
The value of x and y vary directly, and when x= 4 y equals -10. find the value of y when x equals 10.
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Ответ:
y = - 25
since x varies directly with y then we can express the relationship as
x = ky ← k is the constant of variation
to find k use the given condition y = - 10 when x = 4
k =
= 
= - 
hence x = -
y
when x = 10
10 = -
y
multiply both sides by - 5 and divide both sides by 2 )
- 50 = 2y ⇒ y = - 25
Ответ: