the set of all values which, when substituted for unknowns, make an equation true.
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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.
The equation y = -2.5 represents a horizontal line on the Cartesian plane passing through the point (-2.5, 0). This line is parallel to the x-axis and has a slope of 0. The solution to this equation is all real numbers on the y-axis that have a value of -2.5.