TayTae2237
21.08.2019 •
Mathematics
If y varies directly with x, write an equation for the direct variation. then find each value.
1. if y= - 12 when x=9, find y when x= - 4
2. find y when x=10 if y= 8 when x= 20
3. if y= -6 when x= -14, find x when y= -4
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Ответ:
y = kx
-12 = k(9)
k = -4/3
y = (-4/3)(-4)
y = 16/3
2)
y = kx
8 = 20k
k = 2/5
y = (2/5)(10)
y = 4
3)
y= kx
-6 = k(-14)
k = 3/7
-4 = (3/7)x
-4(7/3) = x
x = -28/3
Ответ:
37
Step-by-step explanation: