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The parametric equation of a line are x=...

The parametric equation of a line are x=3-t and y=1+t. the slope of this line is

A

`-3`

B

`-1`

C

`-(1)/(3)`

D

1

Text Solution

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The correct Answer is:
B
solve `x=3-t` for t to get t=3-x, and substitute this in y=1+t to get y=1+3-x=-x+4. the slope of this line is -1.
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