guerrerogi guerrerogi

03-10-2017
Mathematics

contestada

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

Respuesta :

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

How were life forms affected by the rise in atmospheric oxygen levels that began 2.2 billion years ago?

Find Domain of the functionsquare root of (x-8)/x(x-9)

Which equation has the same y-intercept as y=4x-3?a. y-3=x b. y=8x+3 c. 3-y=4x d. y=-3+8xWhich of the following is the equation of the line

Scarcity is the condition of not having enough goods and services to satisfy everyone's?

Prove that (x^5)-(x^2)+2x +3=0 has at least one real root. Prove that x=cosx has at least one solution.

(10y^3+20y^2+55y)/5y

find an equivalent expression without parentheses -(50x-15y+15)=

How were life forms affected by the rise in atmospheric oxygen levels that began 2.2 billion years ago?

Which equation has the same y-intercept as y=4x-3?a. y-3=x b. y=8x+3 c. 3-y=4x d. y=-3+8xWhich of the following is the equation of the line

Historians of china have traditionally dated the beginning of Chinese civilization to the founding of the what??