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3 years ago

Solve these simultaneous equations: 2x + 4y = 38 7x - 4y =7

Mathematics

2 answers:

lesya [120]3 years ago

6 0

Answer:

x=5, y=7

Step-by-step explanation:

2x+4y= 38

+7x-4y= 7

9x= 45

9x/9= 45/9

x=5

2x+4y=38

2(5)+4y= 38

10+4y= 38

-10 -10

4y= 28

4y/4= 28/4

y=7

vichka [17]3 years ago

4 0

Answer:

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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nordsb [41]

Answer:

Step-by-step explanation:

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4 years ago

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3 years ago

Solve and explain how you did

Sliva [168]

Answer:

We conclude that:

$-\left(9x\right)^0=-1$

Step-by-step explanation:

Given:

$-\left(9x\right)^0$

To determine:

Explain how to solve the expression

<u>Solving the expression</u>

$-\left(9x\right)^0$

Apply the exponent rule

$a^0=1,\:\quad \:a\ne \:0$

so the expression becomes

$-\left(9x\right)^0\:=\:-1$

Therefore, we conclude that:

$-\left(9x\right)^0=-1$

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3 years ago

Daniela needs to cut a rectangular hole in a wall where a new window will be installed. The window will be 4 feet high and 3 fee

BlackZzzverrR [31]

Answer:

Measure the diagonals, they should be 5 feet (3,4,5 triangle).

Step-by-step explanation:

As a more general answer, the diagonal measurements of ANY rectangle will be equal. You can calculate the correct measurement using A^2 + B^2 = C^2. A and B are the lengths of the sides and C is the length of the diagonals.

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4 years ago