Question

if (a + b,7a - 2b - 18) lie on origin than find the value of a :
correct answer will be mark as brain list

Answer 1

Answer:

if the point lies on the origin then

it's coordinates are 0

Step-by-step explanation:

hence

$a + b = 0 \\ \\ 7a - 2b - 18 = 0$

solving this we get

$b = - 2 \: and \: a = 2$

Answer 2

Answer:

2 is the correct answer

Step-by-step explanation:

a+b=0

Let a (+) and b (-)

7a-2b-18=0

7a-2b=18

let a=2 and b=(-)x2 ={-2}

(7x2)-(2x-2)=18

14-(-4)=18

14+4=18

18=18

So, a=2 is correct