3x + 2y = -7
2y = -3x - 7
y = (-3/2)x - 7/2
m = -3/2, and perpendicular lines have opposite, reciprocal slopes. We can solve two ways.
1. Use the point-slope formula.
y - y1 = m(x - x1)
y - 1 = (2/3)(x - 1)
y - 1 = (2/3)x - 2/3
y = (2/3)x + 1/3
2. Plug in our point and solve for b.
y = mx + b
1 = (2/3)1 + b
1 = 2/3 + b
b = 1/3
y = (2/3)x + 1/3