math(algebra 1)
posted by please help!!! .
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!!:)

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 
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!! 
2) you are correct
x  y = 4
add + y to both sides
x  y + y = 4 + y
x = 4 + y
Respond to this Question
Similar Questions

algebra 1
use the substitution method to solve the linear system. 9x+6y=3 3x7y=26 please show me an example of how to do it. 
algebra
Requesting help. (I must reckon, that X is a variable, and y is yintercept) Q: Try to use the substitution method to solve the the linear system y=3x an y=3x7. What do you notice? 
algebra
solve by the subtitution method. 2x+3y=8 6x+y=36 I came up with (2,6) am I close 
maths
use the substitution method to solve the linear system. 1. 3x=9 x+2y=9 3x/3 = 9/3 x = 3 x(3)+2y = 9 3+2y = 9 2y = 12 y = 6 is (3,6) correct? 
MaTh = Algebra = help
Solve this system of linear equaiton by an algebraic method. So If I had to solve this the elimination method way, how would I do it? 
intermediate algebra
Solve uing the subtitution method. Show your work. If the system has no solution or an infinite number of solutions, stat this,3x15y=12 3x+24y=12 
Algebra
Use substitution method to solve the linear system. Can someone please check if I did this problem right? 
Algebra
Use the substitution method to solve the linear system. 1/8p+3/4q=7 3/2pq=4 Thanks. 
Math 2 questions
Use the substitution method to solve each linear system: x+3y+1=0 3xy+1=0 4x3y=13 2x+y=4 Please help, thanks:):)!!!! 
TO ANY MATH HELPERS
Pleeeese help! Use the substitution method to solve each linear system: x+3y+1=0 3xy+1=0 4x3y=13 2x+y=4 Please help, thanks:):)!!!!