The following equations 2x + y = 4 x + 2Y = 5 are solved by substitution method

The following equations 2x + y = 4 x + 2Y = 5 are solved by substitution method


Y = 4-2x, x + 2Y = 5
x+2(4-2x)=5
x=1
y=2



If x and y are opposite to each other in the solution of the equations 4x-3y = 7, (K + 1) / 2 = K-3, the value of K is obtained


What kind of magic question is this?
From the first formula and X, y are opposite numbers, x = 1, y = - 1
From the second formula, k = 7

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