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4 years ago

5x + 15 = 75 State your answer as a decimal, not a fraction.

Mathematics

2 answers:

Stella [2.4K]4 years ago

7 0

5x+15=75
-15
5x=60
X=12

Llana [10]4 years ago

6 0

Answer:

x = 12

Step-by-step explanation:

5x + 15 = 75

5x = 75 - 15

5x = 60

x = 60 : 5

x = 12

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we know that

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ser-zykov [4K]

Let x be the digit in the tens place and y be the digit in the ones place.
so, the digit is xy

The ten's digit of a two digit number is 1 more than 4 times the units' digit.
x = 4y + 1

63 is subtracted from the number, the order of the digits is reversed
10x + y - 63 = 10y + x
9x - 9y = 63

x = 4y + 1 ------------ (1)
9x - 9y = 63 ---------- (2)

Sub (1) into (2)
9(4y + 1) - 9y = 63
36y + 9 - 9y = 63
27y = 63 - 9
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y = 2 ------- sub into (1)

x = 4(2) + 1 = 9

x = 9, y = 2
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4 years ago