It is a linear equation in the variable a.
It is a linear equation in x. It has a solution, which is x = -5
5r = 25 is a linear equation in one variable, r. The solution is r = 5.
An equation
You were going along pretty good until you hit the words "to the second power". Right there, you no longer have a 'linear' equation. The question looks like you're trying to say one of the following two equations: Either x + y2 = 25 or (x + y)2 = 25. Neither is a linear equation. Each is the equation of a parabola.
It is a linear equation in the variable a.
It is a linear equation in x. It has a solution, which is x = -5
5r = 25 is a linear equation in one variable, r. The solution is r = 5.
An equation
You were going along pretty good until you hit the words "to the second power". Right there, you no longer have a 'linear' equation. The question looks like you're trying to say one of the following two equations: Either x + y2 = 25 or (x + y)2 = 25. Neither is a linear equation. Each is the equation of a parabola.
Equation
9
25
It is a linear equation in the variable x. You can solve for x using algebra: -5x + 3 = -22 -5x = -25 -x = -5 x = 5
Technically there are no variables in this equation, as 47 minus 25 is equal to x (22)
r = 25
X=65