anonymous
  • anonymous
Find the y-coordinate for the solution of the system of linear equations. 5x - 3y = -11 -7x - y = 5
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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myininaya
  • myininaya
Ok the easiest way for me to solve this would be to multiply the bottom equation by -3 and then add the equations
myininaya
  • myininaya
5x-3y=-11 -> 5x-3y=-11 -7x-y=5 times -3-> 21x+3y=-15 --------------- add 26x+0=-26 26x=-26
myininaya
  • myininaya
Does that look as pretty as it does to me on my screen?

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anonymous
  • anonymous
Yes it does
myininaya
  • myininaya
Great so what is x?
anonymous
  • anonymous
26
myininaya
  • myininaya
Try again We have 26x=-26
anonymous
  • anonymous
-26 lol
myininaya
  • myininaya
26x = -26 -- --- Divided both sides by 26 26 26
myininaya
  • myininaya
26/26=1 and -26/26=-1 so we have 26x = -26 -- ---- 26 26 => 1x = -1 => x = -1
anonymous
  • anonymous
oh ok i got it now thanx
myininaya
  • myininaya
But we want to know what y is... So take this -1 and go to one of the equations that were given to you and replace x with -1 and solve for y and then you will be done :)
apoorvk
  • apoorvk
great patience and explanation work @myininaya. you inspire!!
anonymous
  • anonymous
so the answer would be 1
myininaya
  • myininaya
So this is one of the equations given to you: 5x - 3y = -11 and we found x to be -1 So replacing x with -1 gives me 5(-1)-3y=-11 -5-3y=-11 Can you solve this for y?
anonymous
  • anonymous
no i cant
myininaya
  • myininaya
-5 - 3y = -11 To solve for y (or to isolate y) some possible steps to take are: To first add 5 on both sides -5 - 3y = -11 +5 +5 --------------------- 0 - 3y = -6 -3y = -6 Can you solve this equation for y? I know you can do it :) Try.
anonymous
  • anonymous
it would be 2

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