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34kurt
3 years ago
14

What equation has the solution n=-2/3? A: 4n+5=7/3 B: 2n+4/3=1 C: 4n+7/3=5 D: 2n+1=4/3

Mathematics
1 answer:
serious [3.7K]3 years ago
6 0

A has the solution of -2/3.

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6 0
3 years ago
X+3y-2z=10, -x-2y+z=-7, 3x+9y-5z=28
NISA [10]
Hmm
what you do is try to eliminate 1 variable in 2 equaions first
we can elminate x's in first and 2nd equation

add first and 2nd equation
x+3y-2z=10
<u>-x-2y+z=-7 +</u>
0x+y-z=3
y-z=3


multiply 2nd equation by 3 and add to last one
-3x-6y+3z=-21
<u>3x+9y-5z=28 +</u>
0x+3y-2z=7

3y-2z=7

we now have
y-z=3
3y-2z=7
multiply first equation by -2 and add to 2nd

-2y+2z=-6
<u>3y-2z=7 +</u>
y+0z=1
y=1

now we can sub back
y-z=3
1-z=3
minus 1
-z=2
times -1
z=-2

sub baack into any equation
x+3(1)-2(-2)=10
x+3+4=10
x+7=10
minus 7
x=3

x=3
y=1
z=-2
(3,1,-2)

6 0
3 years ago
Read 2 more answers
Which choice is equivalent to the fraction below? 1/4
RoseWind [281]
The second one because 1/4 times 3/3 equals 3/12
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3 years ago
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