systems of eqn in two variables

[jferrel8]

how do you solve the system graphically:
3x-4y+4=0
x+4y-20=0
solve the system using substitution:
3x-y-1=0
x+y+9=0
solve the system using elimination:
3x+y+12=0
2x+3y+15=0
Solve the system using ANY method:
3x-4y=4
6x+10y=1.5
and.....
4x-3y=5
9x+4y= - 11

 

[tkhunny]

See, I was right. You have been sleeping in class. These are lovely review problems.

how do you solve the system graphically:
3x-4y+4=0
x+4y-20=0

Graph the two lines and see where they intersect.

solve the system using substitution:
3x-y-1=0
x+y+9=0

Solve one equation for one variable and substitute into the other equation.

solve the system using elimination:
3x+y+12=0
2x+3y+15=0

Multiply the top equation by -3 (Why did I pick that?) and add the new equation to the bottom equation. Something magical will occur.

Show your work.

 

[stapel]

how do you solve the system graphically, using substitution, using elimination, using ANY method....

Study and learn! :wink:

. . . . .Google results for "solving systems linear equations"

Have fun!

Eliz.