Question

Which value of x satisfies both 3x + y = 9 and 3x − 5y = 15?
A) \[\frac{ 10 }{ 3 }\]
B) \[\frac{ 2 }{ 3 }\]
C) \[-1\]
D) \[0\]

@thomaster @satellite73 @maxdrizner

Answer 1

3x + y = 9 --->(5)
3x - 5y = 15
-----------
15x + 5y = 45 (result of multiplying by 5)
3x - 5y = 15
------------add
18x = 60
x = 60/18 = 30/9 = 10/3

answer is 10/3

Answer 2

any questions ?

Answer 3

Nope, that definitely helped me A LOT! Thank you so much, you're an excellent help :).

Answer 4

no problem :)