Solve the systems below:
1. x + 7y = 0
2x − 8y = 22
2. x − y = 3
7x − y = −3
3. −9 + 5y = −4x
−11x = −20 + 9y
4. y = 4x − 9
y= x− 3
Tell which method you used to solve each system and why you chose that method.

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain