Dgbcool
Dgbcool Dgbcool
  • 04-08-2017
  • Mathematics
contestada

Help my please with math

Help my please with math class=

Respuesta :

choixongdong
choixongdong choixongdong
  • 04-08-2017
8x + 7y = -15 (1st)
-7x - 9y = -7 (2nd)

multiply (1st) by 7 and (2nd) by 8

56x + 49y = -105 (multiply 7)
-56x - 72y = -56 (multiply  8)
--------------------------------------------add
         -23y = -161
               y = 7

8x + 7y = -15
8x + 7(7) = -15
8x + 49 = -15
8x = -64
x = -8

answer
x = -8 and y = 7
Answer Link

Otras preguntas

What happens to the particles of a substance when thermal energy is added to the substance?
Which is an example of an object acquiring a charge through friction? A. As you walk across a thick carpet, your body becomes charged. B. The air between a meta
harold was 5 years older than Mary. In 10 years he found that 4 times his age exceeded twice Mary's age by only 50. How old were Harold and Mary in the beginnin
Colonial protests and boycotts against the stamp act eventually led to
Which organelle does the krebs cycle take place?
Why do substances with weak intermolecular forces form solids at low melting points?
Which is smaller two thirds of 27 or 2/5 of 20?
What happens to the particles of a substance when thermal energy is added to the substance?
What is one-third of 2,700?
What is 8/10 minus 1/2?