Y-(-3)=-0.25(x-a)

Solution for Y-(-3)=-0.25(x-a) equation:

Simplifying
Y + -1(-3) = -0.25(x + -1a)

Multiply -1 * -3
Y + 3 = -0.25(x + -1a)

Reorder the terms:
3 + Y = -0.25(x + -1a)

Reorder the terms:
3 + Y = -0.25(-1a + x)
3 + Y = (-1a * -0.25 + x * -0.25)
3 + Y = (0.25a + -0.25x)

Solving
3 + Y = 0.25a + -0.25x

Solving for variable 'Y'.

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

Add '-3' to each side of the equation.
3 + -3 + Y = 0.25a + -3 + -0.25x

Combine like terms: 3 + -3 = 0
0 + Y = 0.25a + -3 + -0.25x
Y = 0.25a + -3 + -0.25x

Reorder the terms:
Y = -3 + 0.25a + -0.25x

Simplifying
Y = -3 + 0.25a + -0.25x