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Solve a system of linear equations using substitution, elimination OR substitution!
3x  y = 137
y = 2x + 99
 one year ago
 one year ago
Someone Please Help! Solve a system of linear equations using substitution, elimination OR substitution! 3x  y = 137 y = 2x + 99
 one year ago
 one year ago

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irkizBest ResponseYou've already chosen the best response.1
3x  y = 137 ...........(1) y = 2x + 99 ..............(2) substitute (2) into (1) 3x (2x+99) = 137 try solving it now
 one year ago

nubeerBest ResponseYou've already chosen the best response.0
put your second equation in first one 3x ( 2x+99) = 137 find x now.
 one year ago

JessNicoleBest ResponseYou've already chosen the best response.0
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??
 one year ago

JessNicoleBest ResponseYou've already chosen the best response.0
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:\
 one year ago

JessNicoleBest ResponseYou've already chosen the best response.0
sorry, i meant *eliminating* and graphing!
 one year ago

allibear2012Best ResponseYou've already chosen the best response.0
ok mmmmmmmmhhhhhhhhhhhhhhhhhhh... i am not sure how much help that i will be since i am 10 years old :/
 one year ago

JessNicoleBest ResponseYou've already chosen the best response.0
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
 one year ago

allibear2012Best ResponseYou've already chosen the best response.0
ok i will try... gtg sorry :((
 one year ago

JessNicoleBest ResponseYou've already chosen the best response.0
kay, bye. thanks tho
 one year ago

irkizBest ResponseYou've already chosen the best response.1
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
 one year ago

JessNicoleBest ResponseYou've already chosen the best response.0
Wait, 2x + 8y = 20, i can't solve it no more, can i ? idk, i'm confused! how do you get (3)  (1) ?
 one year ago

irkizBest ResponseYou've already chosen the best response.1
(3)  (1) as in equation (3)  equation(1) to eliminate the 2x which is common in both equations
 one year ago

irkizBest ResponseYou've already chosen the best response.1
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
 one year ago

irkizBest ResponseYou've already chosen the best response.1
2x + y = 1......(1) 2x + 8y = 20...(3) (3)  (1) 2x  2x +8y  y = 20  (1) 7y = 19
 one year ago

JessNicoleBest ResponseYou've already chosen the best response.0
Ohh! okay okay, i understand.. so y = 2.714 ?
 one year ago

JessNicoleBest ResponseYou've already chosen the best response.0
@irkiz thank you anyways
 one year ago
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