Algebra

A. 2x+3y+4z=-3

2x=-3-3y-4z

1--x=-3y-4z-3

B. x+ y + z =1

x=1-y-z

2---x=-y-z+1

C. 3x+5y-z= 25

3x=25-5y+z

x =z-5y+25/3-3y-4z-3=-y-z+1

-3y-4z-y=1+3

-4y-4z=4

-1(-4y-4z=4)=

4y+4z=-4

4y=-4z-4

y=-4z-4/4

-3y-4z-3=z-5y+25/33(-3y-4z-3)=5y+25

-9y-12z-6 =5y+25

-9y-5y-12z=25+6

-14y-12z=31

-1(-14y-12z=31) =14y+12z=-31

14y+12z=-31

14y=-12z-31

y=-12z-31/14-4z-4/4=-12z-31/14

14(-4z-4)=4(-12-31)

-56z-56=-48-31

z=-79/-112

z=1.5




14y+12z=-31

14y+12(1.5)=-31

14y+18=-31

14y=-31-18y=-49/14

y=-3.5




x+ y + z =1

x+(-3.5)+1.5=1

x=3.5-1.5+1

x=3



A. 3x-2y=40

3x=40+2y

x=2y+40/3

B. 2x+5y=-5

2x=-5y-5x=-5y-5/2

2y+40/3=-5y-5/2

2(2y+40)=3(-5y-5)

4y+80=-15y-15

15y+4y=-15+80

y=95/19

y=5

3x-2(1.3)=40

3x-2.6=403x=2.6+40

x=42.6/3

x=14.2

A. 2/3x-1/4y=19/2

8x-3y=19/2




2(8x-3y)=19




16x-6y=19




16x=6y+19x=6y+19/16




B. 1/5x+2/7y=29/5

7x+10y=29/5




5(7x+10y)=29




35x+50y=29




35x=29+50yx=29+50y/35




6y+19/16=29+50y/35

35(6y+19)=16(29+50)

210y+684=464+800

210y=-684+464+800

y=580/210

y=2.71/5x+2/7y=29/5

7x+10y=29/5

7x+10(2.7)=29/5

5(7x+27)=29

35x+135=29

35x=29-135

x=106/35

x=3.02