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Mademuasel [1]
3 years ago
12

The points (-3,9) and (-1,r) lie on line with slop -2.

Mathematics
1 answer:
adell [148]3 years ago
7 0

Answer:

The value of r is 5

Step-by-step explanation:

<u><em>The question is</em></u>

Find out the value of r

we know that

The formula to calculate the slope between two points is equal to

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

we have the points

(-3,9) and (-1,r)

substitute

m=\frac{r-9}{-1+3}

m=\frac{r-9}{2}

Remember that

m=-2

substitute the value of m

-2=\frac{r-9}{2}

Solve for r

Multiply by 2 both sides

-4=r-9

Adds 9 both sides

-4+9=r-9+9

5=r

Rewrite

r=5

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