Question

solve this 9th class hard question of coordinate geometry.
I don't like MCQ's but fir bhi options are
(a)3
(b)4
(c)-3
(d)-4
​

Answer 1

Answer:

a=4 option b

Step-by-step explanation:

y=x+a.

(x,y )=(-1,3).

Then Substitute,

x and y

3=-1+a

3+1=a

4=a

a=4.

option b

Answer 2

Answer:

Here given,

(-1,3) point lies on the equation of line,

y = x + a

so the point (-1,3) will satisfy the equation.

so,

$\: \: \: \: \: \: \: y = x + a \\ \implies \:3 = - 1 + a \\ \implies \:a = 3 + 1 \\ \therefore \: a = 4$