All of the above its all right
Answer:
china invaded japan european powers
Explanation:
Good question:
George Washington became president in 1789 when 69 members of Congress decided to vote him president. He was a military General and at that time, would be a perfect president.
The reason he became president was that: "George Washington, the commander of the Continental Army during the Revolutionary War, is unanimously elected the first president of the United States by all 69 presidential<span> electors who cast their votes."
Quoted answers are NOT mine. All credits go to their owner.s
Source/Answer credits.
http://www.history.com/this-day-in-history/george-washington-is-elected-president
Further information/answers provided in the link above.
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the introduction of the variable z means that the graphed functions now represent planes, rather than lines. the substitution method involves solving for one of the variables in one of the equations, and plugging that into the rest of the equations to reduce the system.