Question

Find k if R(1,-1) S(-2,k) slope of line RS is - 2​

Answer 1

$slope \: of \: a \: line \: = x2 \: - x1 \div y2 - y1 \\ \\ - 2 - 1 \div k - ( - 1) = - 2 \\ - 3 = - 2k - 2 \\ - 3 + 2 = - 2 k \\ 1 \div 2 = k$

Answer 2

we know that

slope of a line

$= \frac{y2 - y1}{x2 - x1}$

then according to the given data

$- 2 = \frac{k + 1}{ - 2 - 1}$

$6 = k + 1$

then ,

$k = 5$

I hope it helps you

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