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Y=3x
2x+y=15
Can you please help with this? It's confusing. It's soling systems of equations by substitution

Sagot :

it's simple jus plug in 3x into Y and u will have 2x+3x=15 
                                                                              5x=15
                                                                               the answer(x=3)
Apologiabiologyidn
so you subtitute y=3x into
2x+y=15
so
2x+(3x)=15
add like terms
5x=15
divide both sides by 5
x=3

subtitute x=3 into first equation (y=3x)
y=3(3)
y=9
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