elstone01
10.02.2020 •
Mathematics
Find y when x=5, if y varies directly as x and y= 5 when x=3.5
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Ответ:
3.5
Step-by-step explanation:
In variation, and from the above question,
y ∞ x ,
y = kx , where k is the constant of proportionality
first find the constant k
5 = 5k
Therefore
k = 1
Now to find y , substitute for k and x in the first equation above
y = kx
y = 1 x 3.5
y = 3.5
Ответ:
2.c
3.b
4.784
5.part a: coefficient: 75 variable: d constant: 25
part b: 75d+8w+25=
75*5+8*48+25=
375+384+25=
759+25=
784
part c: the constant would change, because there is no variable attached to the number.