zscurry13
zscurry13 zscurry13
  • 07-05-2020
  • Mathematics
contestada

4.)
5x+4y=-30
3x –9y=-18
What is the solution to this problem

Respuesta :

nktselepov
nktselepov nktselepov
  • 07-05-2020

[tex]5x + 4y = - 30 | \times ( - 3) \\ 3x - 9y = - 18 | \times 5 \\ \\ - 15x - 12y = 90 \\ 15x - 45y = - 90[/tex]

Now add 2 equations

[tex] - 57y = 0 \\ y = 0[/tex]

Now we need to put y into any equation

[tex] - 15x - 12 \times 0 = 90 \\ - 15x = 90 \\ x = - 6[/tex]

Answer: (-6;0)

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