7x-28y=21;3x-12y=9

Simple and best practice solution for 7x-28y=21;3x-12y=9. Check how easy it is, to solve this system of equations and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the system of equations solver your own equations and let us solve it.
Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14

Solution for 7x-28y=21;3x-12y=9 system of equations: 


  • /| 7*x-(28*y)-21 = 0| 3*x-(12*y)-9 = 0
  • We try to solve the equation: 7*x-(28*y)-21 = 0
  • 7*x-28*y-21 = 0 // - 7*x-21
  • -28*y = -(7*x-21) // : -28
  • y = (-(7*x-21))/(-28)
  • y = (21-(7*x))/(-28)
  • We insert the solution into one of the initial equations of our system of equations
  • We get a system of equations:
  • /| 3*x-(12*((21-(7*x))/(-28)))-9 = 0| y = (21-(7*x))/(-28)
  • (-1*12*(21-7*x))/(-28)+3*x-9 = 0
  • 9-9 = 0
  • 0 = 0
  • The system of equations has infinitely many solutions

 

See similar systems of equations:

| 5x-2y=-13;-5x+2y=-4 | | x+5y=6;x+4y=4 | | x+y=3;x-3y=15 | | x+8/3=12-4y/5;6x/7=30-9y/14 | | x/4+y=7/4;-x+4y=-7 | | y=2.3x;y=0.7x+3000 | | y=2.5x;y=0.9x+3000 | | y=2.2x;y=0.6x+2000 | | y=2.4x;y=0.8x+3000 | | y=0.9x+3000;y=x+2.5x | | y=-0.7x+94;y=x+52 | | y=-0.4x+90;y=x+65 | | x+12/7=4-5y/8;9x/4=150-3y/8 | | 7/6x-3/2y=4;-11/12x+5/4y=-3 | | 2.4x;0.8x+3000 | | 1/x+1/y=9;1/x-1/y=3 | | 3/x-9/y=4;1/x-3/y=8/3 | | 2/x+3/y=-5;3/x-2/y=12 | | 4x-3y=16;16x+10y=240 | | y-2x=5;3y=6x+15 | | y=5x-7;y=5x+6 | | -4x-2y=3;-4y=6+8x | | x+y=-2;x-y=16 | | 4x+3y=-2;-4x-6y=8 | | x+y=-9;x-y=-3 | | 2x+y=4;2x+y=6 | | 4x+16y=16;7x-8y=-8 | | 6x+3y=3;x+4y=25 | | x+5y=5;5x-2y=-2 | | 2x+4y=22;3x+2y=17 | | x-7y=49;7x-7y=91 | | 4x-7.3y=77.11;2x+3.7y=-25.39 |

Equations solver categories