Find the value of a if the lines are parallel — task. Mathematics State Board, Class 10.

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If the straight lines

-6 x + 2 y + 9 = 0

and

ax + 10 y + 20 = 0

are parallel, then find the value of \(a\).

Answer:

The value of \(a\) is .

(Note: Insert negative sign if necessary.)

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8. Find the value of a if the lines are parallel