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ra1l [238]
4 years ago
9

3x-4y=-5 5x+8y=-1 solve by elimination please

Mathematics
1 answer:
katovenus [111]4 years ago
7 0
Eliminate y's
double the first equaiton
we get 6x-8y=-10
add to 2nd equation


6x-8y=-10
<u>5x+8y=-1 +</u>
11x+0y=-11

11x=-11
divide both sides by 11
x=-1
sub back


3x-4y=-5
3(-1)-4y=-5
-3-4y=-5
add 3 both sides
-4y=-8
divide both sides by -4
y=2


x=-1
y=2
(x,y)
(-1,2)

the solution is (-1,2)
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Is there a need for explanation?
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4 years ago
The sum of two consecutive numbers is -165. Find the value of the smaller number.
Svetllana [295]

Answer:

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Step-by-step explanation:

x+(x+1)=number

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We can check our work by adding -83+-82=-165 because -83 would be the smaller number.

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7 0
3 years ago
Nicanoa keeps the tickets from Ouzt for events he attends the Rachel baseball tickets to basketball taking his collection is 3:5
Arada [10]

Using proportions, it is found that he has 14 more basketball tickets than baseball tickets.

<h3>What is a proportion?</h3>

A proportion is a fraction of a total amount, and the measures are related using a rule of three. Due to this, relations between variables, either direct or inverse proportional, can be built to find the desired measures in the problem.

His proportion of baseball to basketball tickets is of 3:5. He has 21 baseball tickets, hence the amount of basketball tickets is found according to the following<em> rule of three</em>:

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Applying cross multiplication:

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The difference is given by:

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He has 14 more basketball tickets than baseball tickets.

More can be learned about proportions at brainly.com/question/24372153

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2 years ago
Simplify the expression. 9n - 3n + 5.
Greeley [361]
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5 0
4 years ago
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