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aliahauyon20
17.10.2021 •
Mathematics
Y is directly proportional to x squared. if y=12 when x=2 find x when y=48
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Ответ:
x = 4
Step-by-step explanation:
y = kx²
NOTE: k is constant for proportionality
putting values for x and y
if x is 2
and y is 12
12 = k(2)²
12 = k4
12 = 4k
divide both sides by coefficient of k
12÷4 = 4k ÷ 4
k=3
substitute 3 for k
therefore when
y is 48
and k is constant 3
then x will be:
48=3x²
divide both sides by coefficient of x²
48 divide by 3 = 3x² divide by 3
16=x²
take the square root of both sides
√16 = √x²
x = 4
Ответ:
45 and 65 are not possibe because the other leg isnt a whole number. Same or 195
197 could be because 197^2 = 195^2 + 28^2