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3 years ago

.Solve the system of equations. Use elimination

Mathematics

1 answer:

Elina [12.6K]3 years ago

6 0

Answer:

a) (-9,3)

Step-by-step explanation:

x + 2y = -3

- (x - y = -12)

x + 2y = -3

- x + y = 12

3y = 9

y = 3

x - y = -12

x- 3 = -12

x= - 9

(-9, 3)

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12% of what number is 24

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4 years ago

An appliance repairman charges $25 plus $40 per hour for house calls. Write the rule as an equation that relates hours worked x

soldi70 [24.7K]

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The equation would be y = 40x + 25

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4 years ago

{x}^{2}-10x+21=0x Solve and explain step by step thanks

Alex73 [517]

Answer:

x = 3,7

Step-by-step explanation:

x² - 10x + 21 = 0

x² - 7x - 3x + 21 = 0

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3 0

4 years ago

Read 2 more answers

. A store is going to mark down all of their items by 33%. The cost of a computer you really want is $750. How much will the com

Svetllana [295]

Answer:

$247.50

Step-by-step explanation:

33/100x750=247.50

Since 33% in a fraction is 33/100, use that x 750 and you will get how much the computer gets marked down.

Hope this helps! Thanks.

7 0

3 years ago

Using elimination method

bogdanovich [222]

Answer:

The value of x is 2 and y is (-5)

Step-by-step explanation:

<h3>Given;</h3>

-7x + y = – 19
-2x + 3y = – 19

The value of x and y

<h3>By Using Elimination Method;</h3>

First name the equation

-7x + y = – 19 ...(1)
-2x + 3y = – 19 ...(2)

Now, Multiply equation (1) by 3 we get,

3 × (-7x + y = – 19)

-21x + 3y = – 57

Now, Eliminate

-21x + 3y = – 57

-2x + 3y = – 19

+ – +

-19x = -38

x = -38/-19

x = 2

Now, Put the value of x in equation (2) we get the value of y.

-7x + y = – 19

-7(2) + y = – 19

-14 + y = -19

-14 + 14 + y = -19 + 14

y = -5

Thus, The value of x is (-5) and the value of y is 2.

<h3>For Verification;</h3>

-7x + y = – 19

-7(2) + (-5) = – 19

-14 – 5 = – 19

-19 = -19

-2x + 3y = – 19

-2(2) + 3(-5) = – 19

-4 – 15 = – 19

-19 = -19

Here, L.H.S = R.H.S

Hence Verified!

-TheUnknownScientist 72

4 0

3 years ago