Known equations 2x-y = 7, ax + y = 6 and X + by = a, 3x + y = 8 have the same solution, find the value of a, B!

Known equations 2x-y = 7, ax + y = 6 and X + by = a, 3x + y = 8 have the same solution, find the value of a, B!

2x-y=7
3x+y=8
Add, 5x = 15
x=3
y=-1
3a-1=6
3-b=a
a=7/3
b=2/3

If the equation x − 8x − 7 − K7 − x = 8 has no solution, then the value of K is______ ．

The denominator of the equation is removed to get: (X-8) + k = 8 (X-7), the solution is: x = K + 487, when x = 7, the denominator is 0, the equation has no solution, that is, K + 487 = 7, the solution is k = 1, that is, the equation has no solution when k = 1

If the solutions of the equations 2 - (A-X) / 3 = 0 and 2x + 1 = 3 about X are the same, then the value of a is

2-(a-x)/3=0
6-a+x=0
x=a-6
2x+1=3
2x=2
x=1
a-6=1
a=7

If the solutions of equation 2X-4 = 0 and equation 2 - (A-X) / 2 = 4 are the same, find the value of A

By solving the equation 2X-4 = 0, we get x = 2
Substituting x = 2 into the following equation, we get
2-(a-2)/2=4
a=-2