Which relation is a direct variation that contains the ordered pair (2, 7)?

Asked by maham237 @ 02/12/2020 in Mathematics viewed by 318 People

Answered by maham237 @ 02/12/2020

Choices:
y=4x-1

y=2/7x

y=7/2x

y=7/x

(2,7) ⇒ x = 2 ; y = 7
y = 4x - 1 ⇒ y = 4(2) - 1 ; y = 8 - 1 ; y = 7
y = 2/7x ⇒ y = 2/7(2) ; y = 2/14 ; y = 1/7
y = 7/2x ⇒ y = 7/2(2) ; y = 7/4 ; y = 1 3/4
y = 7/x ⇒ y = 7/2 ; y = 3 1/2

Among the choices, only y = 4x - 1 is the direct variation that contains the ordered pair (2,7)

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