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

which points are located in quadrant!? check all that apply.1. (0,0)2. (1, 1)3. (7,3)4. (5,0)5. (8,0)6. (1,10)

Ivan made a fruit salad for a family gathering. He used 8 ounces of blueberries, 6 ounces of pineapple

I need to show work..

how do you innovate or improve a product?

Which additional natural resource would be MOST IMPORTANT to a society wanting to become industrialized? a) dry land b) strong wind c) rare materials d)availab

how do i do thisss? #7 plzzzzz

Check which statements about square roots are true? Check all that apply. The square root of a positive number cannot be negative. All positive numbers have two

What does Lincoln mean when he says, "The world will little note, nor long remember what we say here"?

How would the pH value of an aqueous solution change, when the hydronium ion concentration is increased by a factor of 10? Select one: a. decreases by 10 b. dec

Solve for x. 3x2 -4 = 8 0 +4 0 0 0