Question

If the lines x+2y=4 & ax+4y=5 are parallel. Find the value of a

Answer 1

Answer:

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Here is your answer .

If the lines are parallel

Then ,

A1/A2 = B1/B2 ≠C1/C2

→ 1/ a = 2/4 = 1/2

→ a = 2

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Answer 2

two lines to be parallel in a set of linear equations

a1/a2 =b1/b2 not equal to c1/c2

where a1,a2,b1,b2,c1,c2 are coefficients of set of linear equations

so 1/a=2/4

so by cross multiplying

we get a=2

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