6x - 3y = 6
y= 2x + 5 replace 2x + 5 for y into the first equation
6x - 3y = 6
6x - 3(2x + 5) = 6
6x - 6x - 15 = 6
0 - 15 = 6
-15 = 6 False
So the system has no solution.
2x + 5 = 13 2x = 8 x = 4
If your question was 2X + 5 =10. X equals what? Then X=2.5
2x-11
2x + 5 = 13 2x = 8 2x/2 = 8/2 x=4
If: -2x+5 = -17 Then: x = 11
4x - 5 + 2x = 37
(-1, 3)
x equals 4
3x+5 = 2x+13 3x-2x = 13-5 x = 8
2x+2=x+5 x=3
x = 5
If 5 x equals 9 plus 2x then x equals?