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Brrunno [24]
3 years ago
7

X + y = 155x - y = 9Elimination method (4, ? )what number is the ?​

Mathematics
2 answers:
mixer [17]3 years ago
8 0
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
vovangra [49]3 years ago
4 0
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)
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