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Maths Puzzle
. If 9x-3y=12 and 3x-5y=7 then 6x-2y = ?
A.-5
B. 4
C. 2
D. 8
Ans. D
Read Solution (Total 4)
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- 9x-3y=12 and 3x-5y=7 or 9x-15y = 21
so 12 y =-9
y=-9/12= -3/4
9x= 3y+12= 12-9/4 = 39/4
x= 39/36=13/12
6x-2y = 6*13/12 - 2*(-3/4) =13/2 +3/2 =16/2 =8..option D - 12 years agoHelpfull: Yes(9) No(3)
- 9x-3y=12....(1) & 3x-5y=7....(2)
multiplying 2nd equation by 3 & equaling two equation
y=-3/4 & x=13/12
then 6x-2y=6(13/12) - 2(-3/4)
=(13/2)+(3/2)
=16/2=8(option D)
- 12 years agoHelpfull: Yes(2) No(0)
- in an hotel,we can order 2 types of varieties.,but we can make 6 more varieties at home.One can choose 4 varieties with 2 from hotel as must.find how many ways one can order???
please provide solution to this? - 12 years agoHelpfull: Yes(0) No(3)
- garima....from where 12 y= -9 came?
- 12 years agoHelpfull: Yes(0) No(2)
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