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3 years ago

PLEASE HELP! much appreciated :D Find the value of x.

Mathematics

1 answer:

Georgia [21]3 years ago

8 0

Answer:

Step-by-step explanation:

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Solve the system of equations algebraically.

nordsb [41]

Answer: D

Step-by-step explanation:

$4x-3y=8\\5x-4y=5$

Let's take one of the equations and solve for a variable to use the substitution method.

$5x-4y=5\\5x=5+4y\\x=\frac{5+4y}{5}$

Now replace this in the first equation.

$4x-3y=8\\4(\frac{5+4y}{5})-3y=8\\\frac{20+16y}{5}-3y=8$

Separate the terms.

$\frac{20}{5}+\frac{16y}{5}-3y=8$

Solve 20/5

$4+\frac{16y}{5}-3y=8$

Subtract 4 from both sides to isolate y.

$4-4+\frac{16y}{5}-3y=8-4$

$\frac{16}{5}y-3y=4$

Solve the difference.

$\frac{16-(3)(5)}{5}y=4\\$

$\frac{16-15}{5} y=4$

$\frac{1}{5}y=4$

Multiply by the reciprocal or the inverted fraction that is next to y to isolate it.

$(\frac{5}{1} )(\frac{1}{5})y=4(\frac{5}{1})$

$y=20$

Now, in order to find x, replace y in any of the two equations.

$5x-4y=5\\5x-4(20)=5\\5x-80=5\\5x=5+80\\5x=85\\x=\frac{85}{5}\\x=17$

7 0

3 years ago

Mrs. Roberts said that your test next week will be wrht 100 points adm will have 29 questions. Each problem is worth either 5 po

SOVA2 [1]

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4 0

3 years ago

If you are at (0,0) on a coordinate grid, what direction do you go to plot point (-2,6)

lidiya [134]

Answer:

go left 2 and up 6

Step-by-step explanation:

(x,y)

(x,y) --> (-2,6)

0 = x 0 = y

0 - 2 = -2 = x

0 + 6 = 6 = y

(-2,6)

When making the X negative, you want to go left on the grid. When making Y positive, you want to go up on the grid.

6 0

3 years ago

Read 2 more answers

Write the product as a mixed number 5 X 3/10

myrzilka [38]

5/1 * 3/10 = 15/10 = 1 5/10 or 1 1/2 as simplest form.<span />

7 0

3 years ago

Read 2 more answers

How do you find your answer step-by-step?

WARRIOR [948]

5.68 x 6.02 ( 10^9)

same base 10 so add the exponent together

4 0

3 years ago