Answer
not a solution
Work Step by Step
An ordered pair is a solution of an equation if its coordinates satisfy the equation itself.
Substitute the m and n values of the given point into the given equation to obtain:
$4m-5n=7
\\4(3)-5(-1)=7
\\12-(-5)=7
\\12+5 = 7
\\17\ne7$
Since the coordinates of the given point do not satisfy the given equation, then the given point is NOT a solution of the given equation.
