Respuesta :

"y−y1=m(x−x1)y−y1=m(x−x1)

⟹y−17=4(x−3)⟹y−17=4(x−3)

⟹y=4x−12+17⟹y=4x−12+17

⟹y=4x+5"

-qoura.com 
Parallel lines means that the gradient is the same. Since the gradient of y = 4x + 7 is 4, the gradient of the parallel line must also be 4.

y = 4x + c
Substitute x = 3, y = 0
0 = 4(3) + c
c = -12

Thus, eqn of parallel line is
y = 4x - 12

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