Posted by Jocelyn on Tuesday, May 24, 2011 at 9:07pm.
- Algebra - Anonymous, Tuesday, May 24, 2011 at 9:42pm
x - 3y = -9
-3y = -9 - x Multiply with -1
3y = 9 + x
4x + 3y= -6
4x + 9 + x = -6
5x + 9 = -6
5x = -6 - 9
5x = -15 Divide with 5
3y=9 + x
3y = 9 +(-3)
3y = 9 - 3
3y = 6 Divide with 3
y = 6/3
x = -3
y = 2
- Algebra - MathMate, Tuesday, May 24, 2011 at 9:56pm
If we note that there is a +3y and a -3y in each of the equations, we simply add the two equations to get:
5x=-15, or x=-3
Substitute x=-3 in either one of the equations to get
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