anonymous
  • anonymous
Someone Please Help! Solve a system of linear equations using substitution, elimination OR substitution! 3x - y = -137 y = 2x + 99
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
what is x?
anonymous
  • anonymous
3x - y = -137 ...........(1) y = 2x + 99 ..............(2) substitute (2) into (1) 3x -(2x+99) = -137 try solving it now
anonymous
  • anonymous
good reply!

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More answers

nubeer
  • nubeer
put your second equation in first one 3x- ( 2x+99) = -137 find x now.
anonymous
  • anonymous
i got y = 23 for substituting. Now i have 2 more equations that i have to find for graphing and eliminating, can someone help me witht hose 2??
anonymous
  • anonymous
i can try
anonymous
  • anonymous
what r they?
anonymous
  • anonymous
THANK YOUU!! 2.) 2x + y = -1 x + 4y = -10 3.) 2x + y = -1 3x - y = 16 And i have to solve it by substituting and the other by graphing:\
anonymous
  • anonymous
sorry, i meant *eliminating* and graphing!
anonymous
  • anonymous
ok mmmmmmmmhhhhhhhhhhhhhhhhhhh... i am not sure how much help that i will be since i am 10 years old :/
anonymous
  • anonymous
:)
anonymous
  • anonymous
Oh myyyy haha, at least you know more than me. I'm 17! Your smart. But if you can just try? or start me off and i can try to figure out the rest by myself
anonymous
  • anonymous
ok i will try... gtg sorry :((
anonymous
  • anonymous
kay, bye. thanks tho
anonymous
  • anonymous
for 2) by elimination 2x+y=-1...........(1) x+4y = -10.......(2) (2) x 2 2x+8y = -20......(3) (3) -(1) 7y = -19 k solve it now
anonymous
  • anonymous
Wait, 2x + 8y = -20, i can't solve it no more, can i ? idk, i'm confused! how do you get (3) - (1) ?
anonymous
  • anonymous
(3) - (1) as in equation (3) - equation(1) to eliminate the 2x which is common in both equations
anonymous
  • anonymous
basically i manipulate (2) so that the x component looks like (1). I then label the manipulated (1) as a new equation (3). (3) and (1) have 2x. so if i take (3) - (1) i will eliminate the 2x and get left with 7y = -19
anonymous
  • anonymous
2x + y = -1......(1) 2x + 8y = -20...(3) (3) - (1) 2x - 2x +8y - y = -20 - (-1) 7y = -19
anonymous
  • anonymous
Ohh! okay okay, i understand.. so y = -2.714 ?
anonymous
  • anonymous
@irkiz thank you anyways

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