Find y' if y = cos(x + y)

Consider the system: y = 3x + 5 y = ax + b what values for a and b make the system inconsistent? what values for a and b make the system consistent and dependent? explain

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Louis wants to carpet the rectangular floor of his basement the basement has an area of 864 square feet the width of the basement is 2/3 its length what is the length of lewis's basement