Math

SOlve - 3x - y = 21 and 3x - 5y = - 3

Asked by AnneS2 on 08 Jun 12:16

Last updated by anonymous on 09 Jun 12:18

1 Answers

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Answered by CherieS on 09 Jun 12:18

- 3x - y = 21

- 3x - y+3x = 21+3x

-y=21+3x

-y/-1=21/-1+3x/-1

y=-21-3x

3x - 5y = - 3

3x - 5(-21-3x) = - 3

3x - 5(-21) (-5)(-3x) = - 3

3x+105+15x=-3

105+18x=-3

105+18x-105=-3-105

18x=-108

18x/18=-108/18

x=-6

y=-21-3x

y=-21-3(-6)

y=-21+18

y=-3