Solve the system by substitution.
y = -9x
y = 2x + 33

2men and 7 boys can do a piece of working 4 days.it is done by 4 men and 4 boys in 3 days how long would it take for 1man or one boy to do it alone

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Aresearch group wants to find the opinions’ of city residents on the construction of a new downtown parking garage. what is the population of the survey downtown shoppers downtown visitors downtown workers city residents