Answer :

The value of j is j = 103 - k = 115 - f.

A collection of equations for which we searched for common solutions is referred to in mathematics as a system of equations, sometimes known as a set of simultaneous equations or an equation system. Similar to single equations, a system of equations can be categorized. In everyday life, systems of equations are used to model problems when the unknown values can be represented by variables.

Consider the two equations,

f + j = 115 ----------------------(1)

j + k = 103 ----------------------(2)

Consider equation (2),

j + k = 103

Subtracting k from each side of the equation.

j + k - k = 103 - k

j = 103 - k

Consider equation (1),

f + j = 115

Subtraction f from each side of the equation,

f + j - f = 115 - f

j = 115 - f

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