guerrerogi guerrerogi
  • 03-10-2017
  • Mathematics
contestada

anyone know how to do this one?
2x+7y=-1
4x-3y=-19

Respuesta :

choixongdong
choixongdong choixongdong
  • 03-10-2017
2x+7y=-1  (1)
4x-3y=-19 (2)

multiply equation (1) by 2
4x + 14y = -2 (1')
4x - 3y =  -19 (2)
---------------------subtract
17y = 17
 y = 1

2x+7y=-1
2x+7(1)=-1
2x + 7 = -1
2x = -8
  x = -4

answer
(-4, 1)
Answer Link

Otras preguntas

Letter to Russian War Minister Alexander Kerensky from soldiers fighting in WW1, August 18th, 1917. Mr. War Misiter! We, soldiers from various regiments[...
What is the answer to 8(1 + 4b)
What is the square foot of 256
Explain the electrolysis of an aqueous solution. (What is produced at each electrode and why its produced) Thank you ​
What is the answer to 1+1=
When an object floats in water, it displaces a volume of water that has a weight equal to the weight of the object. If a ship has a weight of 4753 tons, how man
Conjuguez cues verbs en grad ai present. Je prendre ____ conge aujourd’hui : je eternity ____ fatigue.
Help meee ASAP thank you if you do
What is the most precise name for a quadrilateral with the following vertices: A(2,3) B(7,2) C(6,-1) D(1,0) A) Quadrilateral B) Parallelogram C) Rhombus D) R
Black widow spider history