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  • 14-01-2017
  • Mathematics
Answered

3x-4y=18 x 3y=-7 how do i solve this

Verified Answer :

6SAD6BOY6
6SAD6BOY6 6SAD6BOY6
  • 14-01-2017

3 times (2) gives 3x +9y = -21 (3) 
(3) - (1) gives 13y = -39 
y = -3 
Sub. y=-3 into (2) 
x + -9 = -7 
x = 2 

Answer = (2,-3) 

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