Please help, due in 45 minutes. Which of the following systems of equations would have infinite solutions?

A ) 4x = -4y + 22 and 2x - 2y = 10
B ) -4x = -4y + 22 and -2x + 2y = 11
C ) 12x + 12y = 48 and 6x - 6y = 24
D ) 8x + 8y = 44 and -8x + 8y = -8

Find the value of the cosine for angle a

Can someone pls ! pls answer all. no explanation needed..

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