Asked by james

What is the solution of the system?
y = -3x
3x + 2y =6

I don't get this, please help.
Answered by Ms. Sue
y = -3x
3x + 2y =6

Substitute

3x + 2(-3x) = 7

3x - 6x = 7

-3x = 7

x = - 2 1/3

To find y, substitute -2 1/3 for x in the first equation.

Answered by Damon
use -3x for y
(It is called "substitution")

3 x + 2 (-3x) = 6

3x - 6 x = 6

-3 x = 6

x = -2

y = -3x = 6
Answered by james
thank you guys so so much! I was trying to use elimination for this and it wasn't working at all.
Answered by Ms. Sue
3x + 2(-3x) = 6

x = -2
Answered by Damon
3 x + y = 0
3 x + 2 y = 6
---------------
-y = -6
so
y = 6
then x = y/-3 = -2
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