What are we supposed to do
I see a bunch of equations running together ....
1.) 6x - 3y = 6 ---> y = 2x - 2
etc ?
plz help me understand this
1.) 6x - 3y = 6 2.) y= -2/3x +4
y= 2x + 5 2x + 3y = -6
3.) x+y=0 4.) 3x - 4y = -5
x=y+4 x = y+2
2 answers
I think I see systems of equations:
1.) 6x - 3y = 6
y= 2x + 5
2.) y= -2/3x +4
2x + 3y = -6
3.) x+y=0
x=y+4
4.) 3x - 4y = -5
x = y+2
All you need to do here is set up things in a standard way and solve the pairs of equations. I'll do #2 and you can try the others.
#2.
y= -2/3x +4
2x + 3y = -6
2/3 x + y = 4
2x + 3y = -6
2x + 3y = 12
2x + 3y = -6
Hmm. no solution here
Let's try #1:
6x - 3y = 6
y= 2x + 5
6x - 3y = 6
-2x + y = 5
multiply the 2nd by 3 and add:
6x - 3y = 6
-6x + 3y = 15
WAK! Again no solution.
#3.
x+y=0
x=y+4
x + y = 0
x - y = 4
add 'em
2x = 4
x = 2
y = -2
#4.
3x - 4y = -5
x = y+2
3x - 4y = -5
x - y = 2
multiply the 2nd by 3 and subtract the 1st:
3x - 4y = -5
3x - 3y = 6
y = 11
x = 13
If I read the problems wrong, write them right and you take a stab at solving them.
1.) 6x - 3y = 6
y= 2x + 5
2.) y= -2/3x +4
2x + 3y = -6
3.) x+y=0
x=y+4
4.) 3x - 4y = -5
x = y+2
All you need to do here is set up things in a standard way and solve the pairs of equations. I'll do #2 and you can try the others.
#2.
y= -2/3x +4
2x + 3y = -6
2/3 x + y = 4
2x + 3y = -6
2x + 3y = 12
2x + 3y = -6
Hmm. no solution here
Let's try #1:
6x - 3y = 6
y= 2x + 5
6x - 3y = 6
-2x + y = 5
multiply the 2nd by 3 and add:
6x - 3y = 6
-6x + 3y = 15
WAK! Again no solution.
#3.
x+y=0
x=y+4
x + y = 0
x - y = 4
add 'em
2x = 4
x = 2
y = -2
#4.
3x - 4y = -5
x = y+2
3x - 4y = -5
x - y = 2
multiply the 2nd by 3 and subtract the 1st:
3x - 4y = -5
3x - 3y = 6
y = 11
x = 13
If I read the problems wrong, write them right and you take a stab at solving them.