Question

solve the simultaneous equation -x +2y=0 , 10x+15y = 105​

Answer 1

Answer:

X=-6 and y=3

Step-by-step explanation:

consider-x+2y=0 as equation 1st

and 10x+15y=105 as equation 2nd .

divide equation 2nd by 5,

we get,

2x+3y=21 as equation 3rd.

multiply equation 1st by 2

we get,

-2x+4y=0 as equation 4th.

add equation 3rd and 4th,we get,

2x+3y=21

+ (-2x)+4y=0

7y=21

y= 21/7

therefore y=3

put y=3 in equation 1st

-x+2y=0

-x+2(3)=0

-x+6=0

-x=6

x=-6

therefore we get the solution of simultaneous equation is X=-6 and y=3.