kayleyswanson2004
kayleyswanson2004 kayleyswanson2004
  • 26-01-2020
  • Mathematics
contestada

4 math problem

1. y=-6x-14
-x-3y=-9

2. -5x+2y=-11
5x-3y=14


3. x+10y=-16
x-6y=16


4. -12x-y=15
6x-2y=-30




please help



Respuesta :

devishri1977
devishri1977 devishri1977
  • 26-01-2020

Answer:

Step-by-step explanation:

1)y=-6x-14   ---------(i)

-x-3y=-9  ---------- (ii)

Substitution method:

Substitute y  value in equ (i)

-x -3*(-6x-14) = -9

-x - 3*-6x -3*(-14)= -9

-x + 18x + 42 = -9

17x = -9 -42

17x = -51

x = -51/17

x = -3

Substitute x value in equation (i)

y = -6*-3 -14

y =18-14

y = 4

Answer Link
PieJee PieJee
  • 26-01-2020

Step-by-step explanation:

I'm using substitute in the first and something I don't know the name of in the rest.

Ver imagen PieJee
Answer Link

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