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1 vote
X + y = 15

5x - y = 9
Elimination method

(4, ? )

what number is the ?​

2 Answers

2 votes
4 + y = 15....1
20 - y = 9.....2

....1*5
20 + 5y = 75....3

....3 - .....2
4y = 60
y = 15

the answer for (?) is 15
i’m not sure if this 100% correct but i’m trying my best to help you
User GingerBear
by
8.4k points
7 votes
The ? Is 11.


You add the equations to get rid of one variable, then you have 6x=24 then you divide both sides and you have x=4, then you substitute the given value of x and you are left with 5*4 - y = 9. And the solution or well possible solution is y = 11 which gives youuuuu. (x , y) = (4 , 11)
User Bbiasi
by
8.7k points

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