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If any point (x1,y1) is the solution of the equation ax+by+c = 0 then point must satisfy the equation.
i.e.  ax1+by1+c = 0
given that
point => (0,7/3)
equation => x+3y - 7 = 0
put the point in the equation
0 + 3*7/3 - 7 = 0
0 = 0
hence point (0,7/3) is the solution of the equation x+3y-7 = 0

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Given-the coordinates are (0,7/3)
i.e., x=0 and y=7/3
now by substituting these values in the equation- x+3y=7 OR x+3y-7=0 we get:
hence,as it satisfies the given condition,it is a solution for the equation
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