des0022 des0022
  • 22-02-2019
  • Mathematics
contestada

a line contains the points a(-9,y) and b(-7,-2) find the value of y so the line has a slope of -3

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MrsStrong
MrsStrong MrsStrong
  • 26-02-2019

Answer:

y = -8

Step-by-step explanation:

To find the value for y, use the slope formula:

[tex]m = \frac{y_2-y_1}{x_2-x_1}[/tex]

Substitute m = 3 and (-9,y) and (-7,-2).

[tex]-3 = \frac{y--2}{-7--9} \\\\-3 = \frac{y+2}{-7+9}\\\\ -3 = \frac{y+2}{2}\\\\-6 = y + 2\\\\-8 = y[/tex]

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