Which equation represents a line which is perpendicular to the line y - 4x = 4?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line

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Tell me how you got the it use the figures to answer questions 1and 2. in each diagram, line k is parallel to line l, and line t intersects lines. 1. based on the diagrams, what is the value of x? 2. how would you verify your answer for x?