exam Maths Puzzle Numerical Ability

I want to Thank you for your help. May I please have you show me how to do this problem - I am so confused and have tried to figure this out. Thank you again! What am I doing wrong

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exam Other Question

Write an equation in standard form of the line that passes through (7,-3) and has a y-intercept of 2. x+3y=9
-2x-6y=-18