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

Solution for Y-(-1)=-2(x-(-9)) equation:

Simplifying
Y + -1(-1) = -2(x + -1(-9))

Multiply -1 * -1
Y + 1 = -2(x + -1(-9))

Reorder the terms:
1 + Y = -2(x + -1(-9))

Multiply -1 * -9
1 + Y = -2(x + 9)

Reorder the terms:
1 + Y = -2(9 + x)
1 + Y = (9 * -2 + x * -2)
1 + Y = (-18 + -2x)

Solving
1 + Y = -18 + -2x

Solving for variable 'Y'.

Move all terms containing Y to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + Y = -18 + -1 + -2x

Combine like terms: 1 + -1 = 0
0 + Y = -18 + -1 + -2x
Y = -18 + -1 + -2x

Combine like terms: -18 + -1 = -19
Y = -19 + -2x

Simplifying
Y = -19 + -2x