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jenny00qq
12.06.2020 •
Mathematics
Seven more than one number equals nine less than double that number. Find that number.
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Ответ:
That number is 16.
Step-by-step explanation:
n + 7 = 2n- 9 n represents the number now solve the question
+ 9 +9 add 9 to both sides
n + 16 = 2n subtract n from both sides
-n -n
16= 1n Divide both sides by 1
n= 16
Check: 16 + 7 = 2(16) - 9
23 =23
Ответ:
Explanation:
Step 1 - Write down the information you know
*ps. for this problem we will be using x to represent the unknown number. for future problems, just know that unless a variable has an assigned letter to represent it, you can usually pick whichever letter you’d like
• “Seven more” — “7 +”
• “then one number equals” — “x =”
• “nine less than” — “- 9”
• “double that number” — “2x”
Step 2 - Write an equation using the information you know
x + 7 = 2x - 9
Step 3 - Subtract x from both sides of the equation
x + 7 = 2x - 9
x - x + 7 = 2x - x - 9
7 = x - 9
Step 4 - Add 9 to both sides of he equation and then switch sides
7 = x - 9
7 + 9 = x - 9 + 9
16 = x
x = 16
Now that we have found the value of x, we know that the number is 16.
Ответ: