3 years ago

Y=3x

Mathematics

2 answers:

Anna007 [38]3 years ago

5 0

It's simple jus plug in 3x into Y and u will have 2x+3x=15
5x=15
the answer(x=3)

Mariulka [41]3 years ago

3 0

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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