1.

12. If 10y = 7x - 4 and 12x + 18y = 1; find thevalues of 4x + 6y and 8y - x.

Answer»

7x-10y=4...eq(1)12x+18y=1...eq(2)

Multiply eq.1 by 18Multiply eq.2 by 10

126x-180y=72....eq(3)120x+180y=10......eq(4)

add eq.(3)&(4)

246x=82x=3

y=17/10

To find the value of 4x+6y

substitute value of x and y

12+10.222.2

To find the value of 8y-x

13.6+316.6

4x+6y=22.28y-x=16.6

value of 4x+6y=22.28y-x=16.6

3 will be the answer

4x + 6y=22.2 8y-x =16.6

4x +6y=22.28y-x=16.6



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