##### Solve the system of equations using substitution.

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Solve the system of equations using substitution.

 Solve the system of equations using substitution.3y = –1/2x + 2y = –x + 9

a.  (10, –1)

b.  (–1, 8)

c.  (20, –4)

d.  (3, 6)

Apr 29th, 2015

Something must be wrong here.

Only a. and d. obey the second equation y= -x + 9

but none obey the first equation : 3y=-1/(2x)+2

for a: -1/(2x)+2= -1/20+2 not equal 3y=-3

for d: -1/(2x)+2= -1/6+2 not equal 3y=18

So it can be solved but none of the solutions agree with it.

Apr 29th, 2015

the second equation is 3 y = - 1/2 x + 2

3 y   - one half x + 2

Apr 29th, 2015

Ok it must be b then I'll send you the solution in a sec

Apr 29th, 2015

I meant a

one sec

Apr 29th, 2015

y = -x+9

substitute in the first: 3(-x+9)=(-1/2)x+2

-3x+27=-x/2+2

5x/2=25 => x=25*2/5=10 and y= -10+9=-1

so its a

Apr 29th, 2015

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Apr 29th, 2015
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Apr 29th, 2015
Oct 20th, 2017
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