briannalane120 briannalane120

28-04-2017
Mathematics

contestada

a system of equations is shown below.

which operations on the system of equations will isolate the y quantity?

a) multiply the second equation by 2 and add the result to the first equation

b) multiply the first equation by -7 and the second equation by -5 and add the resulting equations

c) multiply the second equation by -2 and add the result to the first equation

d) multiply the first equation by 7 and the second equation by -5 and add the resulting equations

a system of equations is shown below which operations on the system of equations will isolate the y quantity a multiply the second equation by 2 and add the res class=

Respuesta :

liemonder liemonder

28-04-2017

I: 4x-5y=-10
II: 2x-7y=4

c) multiply the second equation by -2 and add the result to the first equation
II*-2=-4x+14y=-8

add I+II*-2: 4x-5y+(-4x+14y)=-10-8
=9y=-18

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