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

When did Japan surrender? A. after the first atomic bomb was dropped B. the day the Soviet Union invaded Manchuria C. the day after Germany and Italy surrendere

A vertically hung spring has a spring constant of 150. newtons per meter. A 2.00-kilogram mass is suspended from the spring and allowed to come to rest. Calcula

what is the solution to the equation 1/3 (9x-6)= 2x+3

_____________ is a characteristic of communication that is unique to public speaking. a. Context b. Noise c. Delivery d. Message

Which is necessary for a society to be considered a civilization? Choose all answers that are correct. a. literature b. division of labor c. a hierarchy of prie

90 multiplied by 90 equals

How could sand dunes be held in place to prevent them from drifting onto a parking lot???

Why is Harriet Tubman considered a hero?

16 million miles in scientific notation

1. Who is Mao Zedong?