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gayaneshka [121]
3 years ago
8

If the value of y varies directly with x and y=-1 when x=3, find y if x=9

Mathematics
1 answer:
steposvetlana [31]3 years ago
4 0

1.If y varies directly with x

Introduce the constant term k

2.y=kx

where k is the constant term

substitute the value of x and y to form the law

-1=3k

k=-1\3

:y=-1\3x....is the law

To find the value of y when x is 9

Reinstate the law which is y=-1\3x and substitute the value of x to find y

y=-1\3*9

y=-3

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