The parallel lines have the same slope. So we should check the slope from all the options. We will use formula m = (y₂ - y₁) / (x₂ - x₁)
First Option (x₁,y₁) = (-8,8) (x₂,y₂) = (2,2) Find the slope (m) m = (y₂ - y₁) / (x₂ - x₁) m = (2 - 8)/(2 + 8) m = -6/10 m = -3/5 It has the same slope of -3/5, so it's parallel with the line.
Second Option (x₁,y₁) = (-5,-1) (x₂,y₂) = (0,2) Find the slope (m) m = (y₂ - y₁) / (x₂ - x₁) m = (2 + 1) / (0 + 5) m = 3/5 It doesn't have the same slope, so it's not parallel with the line.
Third Option (x₁,y₁) = (-3,6) (x₂,y₂) = (6,-9) Find the slope (m) m = (y₂ - y₁) / (x₂ - x₁) m = (-9 - 6) / (6 + 3) m = -15/9 m = -5/3 It doesn't have the same slope, so it's not parallel with the line
Fourth Option (x₁,y₁) = (-2,1) (x₂,y₂) = (3,-2) Find the slope (m) m = (y₂ - y₁) / (x₂ - x₁) m = (-2 - 1) / (3 + 2) m = -3/5 It has the same slope of -3/5, so it's parallel with the line.
Fifth Option (x₁,y₁) = (0,2) (x₂,y₂) = (5,5) Find the slope (m) m = (y₂ - y₁) / (x₂ - x₁) m = (5 - 2) / (5 - 0) m = 3/5 It doesn't have the same slope, so it's not parallel with the line.
SUMMARY The parallel lines are first option and fourth option
3x was subtracted from the left side, but 3x was subtracted from the right side. The Subtract Property of Equality states that you can subtract the same number from each side and the equation will remain true. But 3x and 3 are not the same number (unless x is 1).