Question 26541
1st: Multiply through  the first equation by 6 to get:
  21x+14y=154
Multiply through the second equation by 12 to get:
  3x+4y=32
Now, let say you want to eliminate the "x" terms.
Multiply through the new 2nd equation by -7 to get:
-21x-28y=-224
Add this to the new 2nd equation to get:
0x-14y=-70
Divide by -14 to get y=5
Substitute that into 3x+4y=32 to solve for "x", as follows:
3x+4(5)=32
3x=12
 x=4
solution for the system of equations is x=4 and y=5
Check that in the equation 21x+14y=154

Cheers,
Stan H.