since a=5 you can put that into your equation of a+7=12
a=5
a+7=12
5+7=12
12=12 Correct
So yes the given number is a solution to the given equation
These are two expressions, not equations. Expressions do not have solutions, only equations do. NB equations include the equals sign.
Equations: 3x-5y = 16 and xy = 7 Solutions: (7, 1) and (-5/3, -21/5)
None. They're the equations of parallel lines, so there's no single pair of numbers for 'x' and 'y' that satisfies both of them.
1
Just one.
These are two expressions, not equations. Expressions do not have solutions, only equations do. NB equations include the equals sign.
Equations: 3x-5y = 16 and xy = 7 Solutions: (7, 1) and (-5/3, -21/5)
It works out that the solutions are: x = 3 and y = 2
0 = 0 is an identity and not an equation. Equations have solutions, identities do not.
They are called the solutions or roots of the equations.
Systems of equations don't equal numbers.
The two rational solutions are (0,0,0) and (1,1,1). There are no other real solutions.
The equations are identical in value, ie the second is merely twice the first...
None. They're the equations of parallel lines, so there's no single pair of numbers for 'x' and 'y' that satisfies both of them.
1
Just one.
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