anonymous
  • anonymous
What is the equation of a line that passes through points (0, 4) and (-4, -8)? y = 2x + 4 y = 2x - 4 y = 3x + 4 y = 3x - 4
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Nnesha
  • Nnesha
first find the slope \[\huge\rm m=\frac{ y_2-y_1 }{ x_2-x_1}\] substitute x's and y's by their value
Nnesha
  • Nnesha
\[\large\rm (x_1 ,y_1)(x_2,y_2)=(0,4)(-4,-8)\] x's and y's
anonymous
  • anonymous
y=2x-4

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Nnesha
  • Nnesha
how did you get that ?
anonymous
  • anonymous
idk how to do it
Nnesha
  • Nnesha
|dw:1439993754267:dw| now substitute x's and y's by their values remember first number in order represent x-coordinate so find sole fist \[\huge\rm m=\frac{ y_2-y_1 }{ x_2-x_1}\] substitute x's and y's by their value
Nnesha
  • Nnesha
slope intercept form is \[\huge\rm y=\color{reD}{m}x+b\] where m is slope and b is y-intercept first we have to find m value
anonymous
  • anonymous
y=4x-4 like that
anonymous
  • anonymous
+
Nnesha
  • Nnesha
|dw:1439994011436:dw| here now replace x's and y's by their valeus
Nnesha
  • Nnesha
|dw:1439994152620:dw| that's how you have to substitute variables by their numbers
anonymous
  • anonymous
y|dw:1439994209239:dw|
Nnesha
  • Nnesha
|dw:1439994289089:dw| y_2 means 2nd y
Nnesha
  • Nnesha
now solve that fraction
anonymous
  • anonymous
|dw:1439994310600:dw|
Nnesha
  • Nnesha
\[\huge\rm \frac{ -8-4 }{ -4-0 } = ???\]
anonymous
  • anonymous
|dw:1439994506801:dw|
Nnesha
  • Nnesha
-8-4 = ???
anonymous
  • anonymous
|dw:1439994601702:dw|
anonymous
  • anonymous
|dw:1439994643265:dw|
Nnesha
  • Nnesha
no it's not equal to -4 pay attention!!
anonymous
  • anonymous
ok
Nnesha
  • Nnesha
so -8-4 = ?? remember you should add them

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