patrickfutrell2537
18.08.2019 •
Mathematics
Which equation would best solve this problem?
five added to 4 times a number is equal to 9 less than 2 times the number.
a.9x + 2 = 5x + 4
b.5x + 4 = 9x – 2
c.4x – 5 = 2x + 9
d.4x + 5 = 2x – 9
explain the answer : )
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Ответ:
"Five" . . . that one is pretty easy.
"4 times a number" . . . 4Q
"Five added to 4 times a number" . . . 5 + 4Q
"2 times the number" . . . 2Q
"9 less than 2 times the number" . . . 2Q - 9
The first quantity is equal to the second quantity . . . 5 + 4Q = 2Q - 9
That's choice D.
What if you had to solve it, and find the mysterious unknown number.
Could you handle it from here ?
5 + 4Q = 2Q - 9
Subtract 5 from each side: 4Q = 2Q - 14
Subtract 2Q from each side: 2Q = -14
Divide each side by 2 : Q = -7
-7 is the only number that will make that original long messy statement true.
Ответ: