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Deemon
03.06.2021 •
Mathematics
5x - 4 + 2x = 3
please help
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Ответ:
x = 1
Step-by-step explanation:
First, combine like terms. Like terms are terms that share not only the same variable, but the same amount of that variable:
5x - 4 + 2x = 3
(5x + 2x) - 4 = 3
7x - 4 = 3
Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. PEMDAS is the order of operation, and stands for:
Parenthesis
Exponents (& Roots)
Multiplications
Division
Addition
Subtraction
First, add 4 to both sides of the equation:
7x - 4 (+4) = 3 (+4)
7x = 3 + 4
7x = 7
Next, divide 7 from both sides of the equation:
(7x)/7 = (7)/7
x = 7/7 = 1
x = 1 is your answer.
~
Ответ:
x = 1
Step-by-step explanation:
5x - 4 + 2x = 3
7x - 4 = 3 (add the Xs together)
7x = 7 (add seven to both sides)
x = 1 (divide both sides by 7)
Ответ:
Divide the difference (.36) by the original price: .36/4.50=.08
Change to a percentage: 8%
The sales tax is 8% :)