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Murrr4er [49]
3 years ago
12

Solve for x : 3x - 24 = 81

Mathematics
2 answers:
Liula [17]3 years ago
4 0
3x - 24 = 81
3x = 81 + 24
3x = 105
x = 35
hodyreva [135]3 years ago
3 0

Answer:

3x - 24 = 81

3x = 81 + 24

3x = 105

x = 105 / 3

x = 35

Step-by-step explanation:

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How do I find these equations using substitution y=-3x+5 and 5x-4y=-3 ?
lapo4ka [179]

Answer:

x=1

Step-by-step explanation:

you would change it to 5x-4(-3x+5)=-3, because you put the info for the first equation into the second equation.

5x-4(-3x+5)=-3

5x+12x-20=-3

17x-20=-3

17x=17

x=1

6 0
3 years ago
Read 2 more answers
An alloy is composed of nickel, zinc, and copper in a 7:2:9 ratio. How many kilograms of each metal is needed to make 3.8 kg of
Tamiku [17]
Ni : Zn: Cu = 7:2:9 =7x : 2x : 9x

7x+2x+9x = 3.8
18x=3.8
x=3.8/18=1.9/9≈0.21

Ni:   7x=7*0.21=1.47 ≈1.5 kg
Zn:  2x=2*0.21=0.42≈0.4 kg
Cu: 9x=9*0.21=1.89 ≈1.9 kg

Check 1.5+0.4+1.9 =3.8 True
6 0
3 years ago
Lcm of 10, 20 and 110
mart [117]

Answer:

220

Step-by-step explanation:

110 cannot be the lcm for 20 but 10 and 110

so 220 can be the lcm for 20, 10, and 110

hope this helps

6 0
3 years ago
Y=-x+7
Allisa [31]
Question 1:
y=-x+7
y=2x-2

(-x+7)=2x-2
-x+7+x=2x-2+x
7=2x-2+x
7+2=2x-2+x+2
9=3x
9/3=3x/3
3=x

y=-x+7
y=-(3)+7
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Question 2:
y-1=2x
y+2x=5

y-1=2x
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(2x+1)+2x=5
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4x=4
4x/4=4/4
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y-1=2(1)
y-1+1=2+1
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Answer: x=1 y=3

6 0
3 years ago
Will give brainliestt
Natasha_Volkova [10]

Answer: (-5, -3)

Step-by-step explanation:

(-10, -6)

-10/2 = -5

-6/2 = -3

7 0
3 years ago
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