anonymous
  • anonymous
if f(2)=5 and f(-1)=-3, find a and b in the function f(x)=ax+b
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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dan815
  • dan815
they gave u 2 points
dan815
  • dan815
(2,5) and (-1,-3)
dan815
  • dan815
can you find the slope given these 2 points?

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dan815
  • dan815
slope is the change in y per every change in x
dan815
  • dan815
for the points (2,5) and (-1,-3) look at how the y changes and how the x changed y from 5 to -3 x from 2 to -1
anonymous
  • anonymous
the slope would be -2 /-3
dan815
  • dan815
y went down -8 x went down -3 -8/-3 = 8/3
dan815
  • dan815
remember from 5 to -3 not 5 to 3
dan815
  • dan815
plug in your slope and one of those points and see what b has to be
anonymous
  • anonymous
oh yes i got -8/-3
dan815
  • dan815
f(x)=ax+b f(x)=8/3x+b pick one of the points (2,5) 5=8/3*(2)+b b=?
dan815
  • dan815
f(x) is another way to say y
dan815
  • dan815
y=8/3x+b we are given point (2,5)<---- x,y value in that order so we can plug that in for x,y 5=8/3(2)+b so we can see what b has to be so that this equation is satisfied
anonymous
  • anonymous
i got -1/3
dan815
  • dan815
yes
anonymous
  • anonymous
thank you so much, i appreciate it
dan815
  • dan815
okay sure thing :)

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