Of course, x-1=8 is a solution.
Any equation which results with the variable value as 9 is ur answer.
For eg: x = 9 / x-9 = 0
1 - x = -8 / x-1 = 8
x-2 = 7 / 2-x = -7
Any, any such equation will be your answer(correct answer).
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If: 5x+2y = 9 Then: y = -2.5x+4.5 in slope intercept form
Root means solution in this context.
On the list that accompanies the question, there is no equation with that solution.
A solution to an question makes the equation true. For example a solution to the equation 3x = x + 6 is x = 3, since 3(3) = 3+6.
Substitute the value found back into the equation, evaluate the expressions and see if the resulting equation is true.