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tensa zangetsu [6.8K]
4 years ago
12

Can someone help me PLZ! I keep posting the same question and no ones helping me :((((((((((((

Mathematics
1 answer:
kipiarov [429]4 years ago
3 0

Answer:

Multiply x + y = 3 by 3 and add it to -3x - 2y = -7

Step-by-step explanation:

When using elimination to solve a system of equations, you multiply one equation by some number. The reason for doing this is that when you add it to the second equation, you want one variable to cancel out. When one variable cancels out (in this case x), you can solve for the other variable (in this case y). I will show this:

3(x + y = 3) = 3x + 3y = 9

   3x +  3y =  9

+ -3x + -2y = -7

---------------------------

              y  = 2

Now, knowing that y = 2, you can substitute y=2 into either equation to solve for x.

-3x - 2(2) = -7

-3x -4 = -7

-3x = -3

x = 1 | to double check (1, 2) as your answer plug these values into both equations

Finding this solution would not have been possible if not for cancelling out the x's above. The other three are wrong because none of the other options cancels out one of the variables.

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KATRIN_1 [288]

Answer:

Following are the solution to this question:

Step-by-step explanation:

Just Parts (c) were discussed because they were mentioned in the issue.

A subpart of (c):

In point (i)

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In point (ii)

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3 0
3 years ago
PLEASE HELP!!!!!!!!!!!!!!!!!!!!
Firdavs [7]

Answer:

A) 150

B)30

Step-by-step explanation:

3 0
3 years ago
Pls click on me I need help( I’m trying to show my mom I’m smart
galben [10]

Answer:

30

Step-by-step explanation:

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8 0
3 years ago
Read 2 more answers
(2a + 15ab) - (7a + 6b - 10ab)
lina2011 [118]

Answer:

5a+25ab-6b

Step-by-step explanation:

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6 0
3 years ago
Solving algebraic equations:<br><br> 5n+1<br><br> What do I do to solve this?
emmainna [20.7K]

Explanation:

The given <em>expression</em> is not an <em>equation</em>. There is nothing that can be <em>solved</em>.

___

An equation has an equal sign between its left side and its right side. Solving it means finding a value for the variable (or variables) such that the equation is true.

For example, we might have ...

  5n +1 = 1

Your familiarity with math facts means you know that ...

  0 +1 = 1

In order for the term 5n to have a value of 0, the value of n must be 0 in this equation. The solution to 5n+1 = 1 is <em>n = 0</em>, because 5×0 + 1 = 1 is a true statement.

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An <em>expression</em> can be evaluated. To do that, put the value you want the variable to be every place you see the variable, then do the arithmetic.

To evaluate 5n+1 for n=6 we put 6 in place of n:

  5×6 +1

Doing the arithmetic, we get ...

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The value of 5n+1 for n=6 is 31.

3 0
4 years ago
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