lgolden0819 lgolden0819

05-11-2017
Mathematics

contestada

If y varies directly as x2 and y = 144 when x = 4, what is the value of y when x = -5?

a. -225
b. 225
c. 180
d. -180

Respuesta :

05-11-2017

y varies with x² times a constant. We will call the constant a
144=ax²
144 = a(4²)
144 = 16a
a = 9
Apply our equation y = 9x²
y = 9(-5)²
y = 9* 25
y=225
Answer is B

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