mariej15
mariej15 mariej15
  • 15-11-2019
  • Mathematics
contestada

x = y - 1
y = -4x + 21

Answers:
A.) (-3,-2)
B.) (9,10)
C.) (4,5)

Please show work!!

Respuesta :

BrainySophiee
BrainySophiee BrainySophiee
  • 16-11-2019

Answer:

C

[tex]x - y = - 1 \\ 4x + y = 21 \\[/tex]

Using elimination method

Add equations 1 and 2

[tex]x + 4x \\ - y + y \\ - 1 + 21[/tex]

[tex]5x = 20 \\ x = \frac{20}{5} \\ x = 4[/tex]

substitute for x in equation 1

[tex]x - y = - 1 \\ 4 - y = - 1 \\ - y = - 1 - 4 \\ \frac{ - y}{ - 1} = \frac{ - 5}{ - 1} \\ y = 5[/tex]

Therefore x is 4 and y is 5

(4,5)

If my answer is right, then please give it the brainliest.

Answer Link

Otras preguntas

Each one of the following sentences contains a clause. In which sentence is the clause used as an adverb? a. All of the delegates who have actual opinions shou
What is 8147 rounded to the nearest thousand
Why were the reforms of the early 1900s, such as the recall, referendum, and initiative provisions, called “progressive”?
During World War II, the term kamikaze referred to Japanese
what's the equation for the length of a rectangle is twice its width the perimeter of the rectangle is 126 feet
Is 24/6 an integer or rational number
Table is semicircle of diameter 12 feet. What is the area usin pi = 3.14
Judy washes 24 dishes. She then dries and stacks the dishes equally into 4 piles. How many dishes are in each pile? 24 divided by 4 = _ 4 x _ = 24 What is the m
What is the value of x when -3x+7x=-12?
For football tryouts at a local school, 12 coaches and 42 players will split into groups. Each group have the same number of coaches and players. What is the gr