How do I solve a system of equation? Can someone explain it to me?

For example:

x - y = 4

2x + y = 5

Convert 86 degrees Fahrenheit to degrees celsius

47% of 157 hours is what?

Gasoline can power a car because the fuel has electrical potential energy chemical potential energy nuclear potential energy static potential energy

The Intelligence Quotient (IQ) test scores for adults are normally distributed with a mean of 100 and a population standard deviation of 15.

Who are the lord of the flies characters

1,000 with an exponent of 8 = 10w

X is a normally distributed random variable with mean 67 and standard deviation 18. What is the probability that X is between 49 and 85? Write your answer as a decimal rounded to the nearest thousandth.

If the range of f (x) = square root mx and the range of g (x) = m square root x are the same, which statement is true about the value of m?

What are the next two terms after 1/8,2/7,3/6,4/5, ... ? And inductive reasoning for it

Steve has $360 in a savings account in the bank. He runs 3% interest each month how much interest would he earn in one month