If the systems of equations 4x + py = 21 and px 2y = 15 has unique solution, - Maths - Pair of Linear Equations in Two Variables

Question

If the systems of equations 4x + py = 21 and px – 2y = 15 has
unique solution, then which of the following could be the value of
p ?
(a) 103 (b) 105 (c) 192 (d) 197
Choose the appropriate option
(1) Both (a) and (b)
(2) Both (c) and (d)
(3) (a), (b) and (d)
(4) All of options
Please do not give any link or hint for the above question

Neha Sethi · Accepted Answer

Dear student
The equations are as follows4x+py-21=0px-2y-15=0Here a1=4, a2=p, b1=p ,b2=-2Now for  a given  pair to have a unique solution : a1a2≠b1b2ie       4p≠p-2p2≠-8Please recheck your question
Regards