Solve each system using substitution. Check your answer.
x+y=8
y=3x

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared