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avanturin [10]
3 years ago
8

Evaluate the expression for x=5, y=-3 and z=7 x + y + z

Mathematics
2 answers:
Nikitich [7]3 years ago
6 0

Answer:

5

Step-by-step explanation:

(Refer to image)

Replace the numbers with the variables and solve using order of operations

lorasvet [3.4K]3 years ago
3 0

Answer:

9

Step-by-step explanation:

convert all the value for x,y,z

5+-3+7

5+-3= 2+7 = 9

I used to decreased the negative 3 to 5 because of the sign negative attached beside the 3. but why the answer becomes to be positive 2? because the positive number which is 5 is greater than the negative 3 in the given.

I hope it helped you.

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a football gains 8 yards on their first play. they lose 12 yards on the next play.. which integers represent the two plays?
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Multiply each equation by a constant that would help to eliminate the y terms.
Zinaida [17]

Answer:

Therefore the required resulting equation is

6x-15y=-63\\-15x+15y=90

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Step-by-step explanation:

Given:

2x-5y=-21         ......................Equation ( 1 )

3x-3y=-18         ......................Equation ( 2 )

To Find:

Expression after multiplying to eliminate y term,

Solution:

So to eliminate 'y' term we need to multiply equation 1 by a constant 3 and equation 2 by a constant -5,  such that equations  becomes

3(2x-5y)=3\times -21\\\\6x-15y=-63 .....( 1 )

-5(3x-3y)=-5\times -18\\\\-15x+15y=90  .....( 2 )

so now by adding new equation one and two we can eliminate y term that means -15y and +15y will get cancel,

Therefore the required resulting equation is

6x-15y=-63\\-15x+15y=90

6 x minus 15 y = negative 63.

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Answer:

14%

Step-by-step explanation:

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$0.14 x 100%

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