A. Directions: Solve the system of equations by substitution and elimnination. Check your solutions. 1. (x + 2y = 7
(x - y = 4 (by elimination)

3. y - x = 3x + 2
2x + 2y = 14 - y (bySubstitution)

please pa help
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An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Exclude leap years from the following calculations. (a) compute the probability that a randomly selected person does not have a birthday on october 4. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability that a randomly selected person does not have a birthday on the 1st day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability that a randomly selected person does not have a birthday on the 30th day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (d) compute the probability that a randomly selected person was not born in january. (type an integer or a decimal rounded to three decimal places as needed.)