Math

Solve for 3x + y = 21 and 2x - y = -1

Asked by AnneS2 on 18 Jun 05:12

Last updated by anonymous on 19 Jun 12:34

1 Answers

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Answered by CherieS on 19 Jun 12:34

3x + y = 21

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

y= 21-3x

2x - y = -1

2x - (21-3x) = -1

2x - 21+3x = -1

- 21+x = -1

- 21+x+21 = -1+21

x=20

y= 21-3x

y= 21-3(20)

y= 21-60

y=-39