Simplify the expression (-5)2. Upvoting is now available.

Mathematics

1 answer:

VMariaS [17]4 years ago

8 0

-(5 x 2)

-10 is the answer

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1. What is the value of x?

Korvikt [17]

57 / 129.2 = VY / 68

vY = 30

x = 30 + 68 = 98 answer

Second part:-

x / 97.5 = (71.5 - 22) / 71.5

x = [ 97.5 ( 71.5 - 22) ] / 71.5

= 67.5 Answer

x =

7 0

4 years ago

Consider the system of equations:

AVprozaik [17]

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Since, we know that in Elimination method we have to first the value of "x" or either "y". For that we have to multiply a number which makes the both equation's "x" or "y" equal so that we cut cancel it and find the solution.

Here's an example:

Like, in here

Equation 1: - 2x + 3y = 9

Equation 2: - 8x - 7y = 10

We can see that in "Equation 1" the first number is "- 2x" and in "Equation 2" the first number is "-8x". So, what we do in Elimination method is that we have to make the first number of both the equations equal or same.

Eg:

- 2x + 3y = 9.

- 8x + 7y = 10--(ii)

Now,we can see that in "Equation 2" the first number is "8x" whereas in "Equation 1" the first number is "-2x". We have to multiply with any number that makes the both the first number of equation is same.