Seudónimo Seudónimo
  • 15-04-2015
  • Mathematics
contestada

−3x + 7y = −16
−9x + 5y = 16

slove this

Respuesta :

eu99li
eu99li eu99li
  • 15-04-2015


{-3x+7y=-16 ⇒ -3x=-16-7y    (↓)

{-9x+5y=16

The second equation:

-9x+5y=16

3*(-3x)+5y=16         Substitute -3x    (↑)

3* (-16-7y)+5y=16

-48-21y+5y=16      /+48

-16y=64      /:(-16)

y=-4

-3x=-16-7y

-3x=-16-7*(-4)=-16+28=12

-3x=12    /:(-3)

x=-4

Solution: (-4; -4)



Answer Link

Otras preguntas

Find the slant heigh of the pyramid
PLEASE HELP, this assignment is worth 45 points and i dont have any free time to finish it
What is the value of x in degrees? (picture above)
Which of the following statements correctly describes the characteristics of the surface features in Column A and Column B? The surface features in column A are
What specifically has happened in scene iv to prompt the thoughts Hamlet expresses in his soliloquy? 1.Hamlet killed Polonius and realized that revenge is not t
which of these colonists performed scientific experiments to explore new ideas?
Please help quickly ​
what role did south african women play against human right violation from the 1950s and 1960s​
Evaluate 4x-3 for x= -2
Which animal adaptation happened before the others? A. Reproduction on land B. Lungs C. Backbone and skull D. Development of a coelomAnswer: D. development of