Solve this system of equations by substitution. Determine whether the system is consistent or inconsistent.
2x+y=9
y=5x+2

Question

Solve this system of equations by substitution. Determine whether the system is consistent or inconsistent. 
2x+y=9
y=5x+2

ajprincess · Answer

Put 5x+2 in place of y in 2x+y=9 and solve for x.
Can u do that @Educate_Me?

anonymous · Answer

Yes, then I did 2(5x+2)=9 
10x+4=9
       -4 -4
10x=5
divide both sides by 10 , is that right ?

ajprincess · Answer

hmm no.
2x+y=9
2x+5x+2=9
7x+2=9
Nw try to solve

anonymous · Answer

I got it! I substituted the 1 I got for x into the y and got the ordered pair (1,7)

ajprincess · Answer

Perfect:)

anonymous · Answer

now this one , I am very confused.. 
1/2x + 3/2y=-7
1/3y=2x-10

ajprincess · Answer

$$\frac{ 1 }{ 2}x+\frac{ 3 }{ 2 }y=-7$$
$$\frac{ 1 }{ 3 }y=2x-10$$

ajprincess · Answer

R those the eqns?

anonymous · Answer

Yes.

ajprincess · Answer

what do u get when u multiply ur second equation by 3?

anonymous · Answer

umm , 3y=2x-10?

ajprincess · Answer

hmm no.|dw:1349542792566:dw|