book Maths Puzzle Numerical Ability

SUPPOSE EACH ORDER PAIRS ARE FOR THE SAME DIRECT VARIATION. FIND EACH MISSING VALUE

A. (-1,2) AND (4,Y)
B. (X,-4) AND (-9,-12)

PLEASE HELP ME!!!!!!!!!!!!!!

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book Other Question
Write the equation of the line passing through (-3,-5) and (3,0).


Thanks -x + y = 13 for y Can you help me find the number for y? I thought the answer was 20 but I was wrong.