(1)

Given point ( x_{1 ,} y₁ ) = ( 1 , 9 ) \ \

Given slope m = 2 \ \

Formula for Slope point form : ( y - y₁ ) = m ( x - x₁ ) \ \

Substitute x₁ = 1 , y₁ =  9 and m = 2

( y - 9 ) = 2 ( x - 1 )

y - 9 = 2x - 2 \ \

2x - 2 - y + 9 = 0 \ \

2x - y + 7 = 0