यदि बिंदु (-2, -5), (2, -2) और (8, a) संरेखीय हैं, तो a का मान क्या है?

1
\(-\frac 5 2\)
2
\(\frac 5 2\)
3
\(\frac 3 2\)
4
\(\frac 1 2\)

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