r+s=12
4r-6s=12
I need to solve the system by substitution and check my answer, please help :(((

Question

r+s=12
4r-6s=12
I need to solve the system by substitution and check my answer, please help :(((

mertsj · Answer

1.  Solve the first equation for r
2.  Replace r in the second equation with the expression you got in Step 1
3.  Solve the resulting equation for s
4.  Replace s with that number in an equation that has both s and r.
5.  Solve for r

anonymous · Answer

can you do it....

anonymous · Answer

like the first one so i can see

mertsj · Answer

1.  r=12-s
2.  4(12-s)-6s=12
48-4s-6s=12
-10s=-36
s=3.6

3.  r=12-3.6
4.  r=8.4

anonymous · Answer

x+y=12
x-y=2
solve by elimination

mertsj · Answer

Ok.  I did the first one so you could see.  Now it's your turn.

anonymous · Answer

but this one is elimanation

mertsj · Answer

Add the two equations.