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.

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