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Desiree97
Group Title
please help: Use the substitution method to solve the linear system.
x+3y=4
x+6y=14
different problem
3x+2y=8
x+4y=4
 2 years ago
 2 years ago
Desiree97 Group Title
please help: Use the substitution method to solve the linear system. x+3y=4 x+6y=14 different problem 3x+2y=8 x+4y=4
 2 years ago
 2 years ago

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ndoane Group TitleBest ResponseYou've already chosen the best response.2
Choose one equation from each pair and solve for y. Then substitute that y into the second equation. IE 3x+y=4 x+2y=7 Solving for y the first equation becomes y=3x+4. Plug that in for y in the second equation: x+2(3x+4)=7 Simplify for x. 5x=1 x=1/5 choose one of original equations and plug in x and solve for y. 3(1/5)+y=4 y=23/5
 2 years ago

mitosuki Group TitleBest ResponseYou've already chosen the best response.0
x+3y=4 x+6y=14 Take an equation: x + 6y = 14 Then make it equal x. x + 6y = 14  6y 6y x =  6y + 14 Then plug x into the first equation that was not used: ( 6y + 14) + 3y = 4 6y  14 + 3y = 4 9y  14 = 4 +14 +14 9y = 18 /9 /9 y = 2 Then plug y into either equation x+3y=4 x + 3(2) = 4 x + 6 = 4 6 6 x = 2 /1 /1 x = 2 The solution for the first problem is x = 2 and y = 2
 2 years ago
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