Posted by please help!!! on Tuesday, January 18, 2011 at 10:53pm.
i don't get these please help me:
use the subtitution method to solve the linear system
1)3x+y=0 xy=4
2)y=3x1 x3y=3
3)3xy=9 2x+y=6
4)x2y=0 3x+y=0
Thank you!!:)

math(algebra 1)  helper, Tuesday, January 18, 2011 at 11:17pm
1)3x + y = 0, x  y = 4
Pick and equation, and solve for either x or y
x  y = 4
x = 4 + y
Substitute, x = 4 + y, for x, in the other equation and solve for y
x = 4 + y
3x + y = 0
3(4 + y) + y = 0
12 + 3y + y = 0
12 + 4y = 0
4y = 12
y = 3
substitute y = 3 in either equation to find x
x  y = 4
x  (3) = 4
x + 3 = 4
x = 1
Now you try the others

math(algebra 1)  please help!!, Tuesday, January 18, 2011 at 11:47pm
so are these correct?
2)y=3x1 x3y=3
x=0 y=1???
3)3xy=9 2x+y=6
dont know help??
4)x2y=0 3x+y=0
please help!!! i don't know how you changed x  y = 4 to x = 4 + y tell me please
Thanks!!

math(algebra 1)  helper, Wednesday, January 19, 2011 at 12:57pm
2) you are correct
x  y = 4
add + y to both sides
x  y + y = 4 + y
x = 4 + y
Answer This Question
Related Questions
 maths  use the substitution method to solve the linear system. 1. 3x=9 x+2y=9 ...
 intermediate algebra  Solve uing the subtitution method. Show your work. If the...
 algebra 1  use the substitution method to solve the linear system. 9x+6y=3 3x...
 Algebra  Use substitution method to solve the linear system. Can someone please...
 algebra  solve by the subtitution method. 2x+3y=8 6x+y=36 I came up with (2,...
 Math 2 questions  Use the substitution method to solve each linear system: x+...
 algebra  Requesting help. (I must reckon, that X is a variable, and y is y...
 MaTh = Algebra = help  Solve this system of linear equaiton by an algebraic ...
 TO ANY MATH HELPERS  Pleeeese help! Use the substitution method to solve each ...
 Algebra  Use the substitution method to solve the linear system. 1/8p+3/4q=7 3/...
More Related Questions