The trivial answer is: Because there is no possible number that 'x' can be
and make the equation a true statement.
If the equation is true ... if the left side is actually equal to the right side ...
then it must still be true after we subtract the same thing from both sides.
Let us subtract 4x from both sides. Then we have 3 = 1 .
That statement is clearly not true. So there's no way for the original equation
to be true, regardless of what number you tell 'x' to be.
-5
Without an indication of the equals sign, this is not an equation.
Not sure what you mean; that equation certainly has a solution.
x = 19
One equation with two unknowns usually does not have a solution.
There is no solution since the equation is inconsistent.
x = 0 and y = 4
The equation does not have a solution.
-5
Without an indication of the equals sign, this is not an equation.
Not sure what you mean; that equation certainly has a solution.
It is a linear equation in x. The equation has the solution x = 0.
x = 19
One equation with two unknowns usually does not have a solution.
That is not a correct equation. The numbers on the left equal -16, not 0. This is an equation with no solution.
The solution is (x, y, z) = (2.5, 1, 2.5).
2