03-06-2015
Mathematics

contestada

−4x + y = 6
−5x − y = 21

Respuesta :

apologiabiology apologiabiology

03-06-2015

assuming x=x and y=y in both equations
add them together

-4x+y=6
-5x-y=21 +
-9x+0y=27
-9x=27
divide by 9
-x=3
multiply -1
x=-3

subsiutte
-4x+y=6
-4(-3)+y=6
12+y=6
subtract 12
y=-6

x=-3
y=-6
the soultion set is in (x,y) form
(-3,-6)

Answer Link

Otras preguntas

9) Center: (-2,9) Point on Circle: (-5, 18)

Porque es importante conocer y analizar los vicios del lenguaje?

(x+3)(3x² - 5x - 10) multiply polynomial

The triangular base of the given prism has an interior angle with a measure of 80° and an interior angle with a measure of 55°. What is the measure of the unkno

the mass of an object is 90 kg calculate weight of the same object on the surface of the moon.(acceleration due to gravity on the Moon surface is 1/6 of the val

Add. write your answer in simplest form. -4 _/135 + 7 _/15

what is the location of the point on the number line that is 3/7 of the way from A=6 to B=20?

Explain why the coyote is considered a limiting factor in the Adirondack Mountains.

Find the volume of the prism.A triangular prism. The base triangle has a base of 7 feet and height 3 feet. The height of the prism is 5 feet.

please help! it’s select all that apply :)