Solve the system of equations using substitution.

Mathematics
Tutor: None Selected Time limit: 1 Day

Solve the system of equations using substitution.


Solve the system of equations using substitution.

3y = –1/2x + 2
y = –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.

Please recheck problem


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

Are you studying on the go? Check out our FREE app and post questions on the fly!
Download on the
App Store
...
Apr 29th, 2015
...
Apr 29th, 2015
Dec 11th, 2016
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer