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Mrrafil [7]
3 years ago
7

Solve for 2 unknowns : 3a+4b=9 ; 2a+2b=6

Mathematics
1 answer:
BARSIC [14]3 years ago
3 0
Let us take the second equation first
2a + 2b = 6
Dividing both sides by 2 we get
a + b = 3
a = 3 - b
Putting the value of a in the first equation we get
3a + 4b = 9
3(3 - b) + 4b = 9
9 - 3b + 4b = 9
b = 9 - 9
   = 0
Now putting the value of b in the second equation we get
a + b = 3
a + 0 = 3
a = 3
So the value of the unknown variable a is 3 and the value of the unknown variable b is 0.

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Answer:

$23.50

Step-by-step explanation:

multiply 12 by 1.75 then add 2.50 to it to get the cost of taxi fee of 12 miles

4 0
4 years ago
3. I am collecting baseball cards. My goal before I turn 18 is to have 500 cards. When I tumed 10,
vladimir2022 [97]

Based on the scenario given, the equation to describe the situation will be: c + 125 + 89 = 500 and 286 cards need to be collected.

Number of cards given by grandfather = 125 cards

Number of cards that will be given by father = 89 cards

Therefore, based on the information given, the equation to describe the situation will be:

c + 125 + 89 = 500

Therefore, we can then use the equation to calculate the number of cards that need to be collected. This will be:

c + 125 + 89 = 500

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c = 500 - 214

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Therefore, the person needs to collect 286 cards.

Read related link on:

brainly.com/question/24910157

7 0
3 years ago
Three numbers have a mean of 64. When a fourth number is included the mean is doubled. What is the fourth number?
astra-53 [7]
The mean is calculated by adding up all of the given numbers and dividing by the number of numbers.

Lets, for ease of understanding, say that the first three number were 64...

Mean=(64+64+64)/3=192/3=64

Now, lets solve for the mean where 'x' is the unknown fourth number and 128 is the mean. (since, the answer said that when the fourth number was added the mean, 64, was doubled '64*2=128')

128=(64+64+64+x)/4
128=(192+x)/4
Multiply both sides by 4
512=192+x
subtract 192 from both sides
320=x

The missing number is 320..


Now lets double check our work.

Mean=(64+64+64+320)/4=512/4=128

Answer=320
8 0
3 years ago
Read 2 more answers
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slava [35]
The answer is 8/10 and that simplified is 4/5
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3 years ago
in the coordinate plane, line m had a slope of 1/4 and a y-intercept of (0,-3). line n is the result of dialating line m by a sc
Verizon [17]

Answer:N/A

Step-by-step explanation:N/A


4 0
3 years ago
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