On the number axis, the distance from the point to the origin represented by the solution of the equation 3M + 4 = 2x about X is 6, then M = 2x___ ．

According to the meaning of the question: x = 6 or - 6, when x = 6, the deformation of the equation is 3M + 4 = 12, that is, M = 83; when x = - 6, the deformation of the equation is 3M + 4 = - 12, that is, M = - 163

It is known that the solution of the system of equations {3x + 5Y = 6,6x + 15y = 15} about X and Y is a solution of the equation 3x + my = 4. Find the value of M

By solving the equations {3x + 5Y = 6,6x + 15y = 15
{x=1
y=3/5
Substitute x = 1, y = 3 / 5 into 3x + my = 4
3 + (3 / 5) M = 4
The solution is m = 5 / 3

How to solve 3x + 6y = 78 3x + 4Y = 72

3x+6y=78 ①
3x+4y=72 ②
②-①
-2y=-6
Y = 3
3x+18=78
3x=60
x=20

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