103k views
3 votes
3x+3y=6 and 5x-6y=15

User Birkensox
by
8.4k points

1 Answer

4 votes
multiply first equaton by 2 and add to the other equation

6x+6y=12
5x-6y=15 +
11x+0y=27

11x=27
divide both sides by 11
x=27/11


sub back
3x+3y=6
divide both sides by 3
x+y=2
(27/11)+y=2
2 and 5/11+y=2
minus 2 and 5/11 both sides
y=-5/11

x=27/11
y=-5/11
(27/11,-5/11)
User Rob Johnston
by
8.0k points

No related questions found