Solving a system of linear equations using substitution

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Use substitution to solve system

x -2y= -8

-2x +5y +21

Answer

y =

x =

Nov 14th, 2015

hello

x -2y= -8

-2x +5y = 21   ( i hope the second equation is like this ,if there is any changes please message)


x-2y = -8

x= 2y-8

substitute this value of x, x= 2y-8 in -2x +5y = 21

                                                         -2 ( 2y-8 )+5y =21

                                                         -4y +16 +5y =21

                                                                     y = 21-16

                                                                    y=5 .....................ANSWER

substitute y=5  in x -2y= -8

                             x - 2*5=-8

                            x = -8 +10

                             x=2........................................ANSWER


ANSWER IS

y=5

x=2



hope you understood..please message if you have any doubts...thank you
Nov 14th, 2015

if you have any doubts in this question or any new questions ,please feel free to message

Nov 14th, 2015

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