Someone please tell me how to do this

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000

Three times the sum of a number and seven is negative thirty-six. what is the number?