Moises is determining the solution to the system of equations that is show below. Equation representing line A: y = one-third x + 1 Points on line B: (3, –12) and (9, –24) Step 1: Determine the slope for B: StartFraction negative 24 minus (negative 12) Over 9 minus 3 EndFraction = StartFraction negative 12 Over 6 EndFraction = negative 2. Step 2: Determine the y-intercept for B: 3 = negative 2 (negative 12) + b. 3 = 24 + b. Negative 21 = b. Step 3: Write the equation in slope-intercept form: y = negative 2 x minus 21