Question

2x – 5y = 7 and x – 2y = -7 then a1b2 – a2b1 = __________​

Answer 1

Answer:

From equation 1: a1 = 2 and b1 = -5

From equation 1: a2 = 1 and b2 = -2

Now,

a1b2 - a2b1 = 2(-2) - 1(-5) = -4+5 = 1.

Hope it helps.

Mark Brainer.

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Teacher.