Question

solve the following pair of linear equation by cross multiplication method 3x+4=-6 3x-y=9​

Answer 1

Answer:

Given that

$3x + 4 = - 6 and 3x - y = 9$

by cross multiply

3x=-6-4 and y=9-x____1

3x=-10

x=-10/3 or x=- 3.33

putting values of x in ___1 we get

y= 9- (-10/3)

y=9+10/3

y=27+10/3 taking 3 LCM

y=37/3

y=12.33