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2 years ago

Use the substitution method to solve the linear system. 4×- 7y = 20 X- 3y = 10

Mathematics

1 answer:

Allushta [10]2 years ago

7 0

Answer: x = -2, y = -4
(WORK SHOWN BELOW)

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Find the percent of change. 72 to 63

gavmur [86]

It should be 67.5. But I'm not 100% sure, so don't take my word.

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4 years ago

Read 2 more answers

How do i solve this equation: 4/5a + 3 = 1/3a - 8

DENIUS [597]

You have to $subtract$ by $\frac{1}{3}a$ on $EACH$ of the $sides$ you're $working$ with!

$\frac{4}{5}a + 3 - \frac{1}{3}a - 8 - \frac{1}{3}a$

Which $gives$ us: $\frac{7}{15}a + 3 = -8$

$Now,$ that we got these $steps$ out of the way, let's $subtract$ $3$ from the sides you're working with!

$\frac{7}{15}a + 3 - 3 \\ = -8 -3$

$\frac{7}{15}(a) = -11$

We have gotten these $steps$ out of the way now lets $multiply$ by $\frac{15}{7}$ on your $sides$ because, it is the $reciprocal$ of $\frac{7}{15}$

So, $\frac{15}{7}( \frac{7}{15}a ) = \frac{15}{7} (-11)$

Cancel out: $\frac{15}{7}( \frac{7}{15} )$ because, it equals to: $1$

$\frac{15}{7}(-11) = \frac{-165}{7}$

Therefore, your $answer$ is: $\frac{-165}{7}$ $aka$ $23\frac{4}{7}$

Good luck on your assignment and enjoy your day

~ $MeIsKaitlyn:)$

5 0

3 years ago

Simplify the (5a^2 b^3)^O

Rudiy27

If you would like to simplify (5a^2 * b^3)^0, you can do this using the following steps:

(5a^2 * b^3)^0 = 5^0 * (a^2)^0 * (b^3)^0 = 1 * 1 * 1 = 1

The correct result would be 1.

6 0

3 years ago

The numbers a, b and c satisfy a+b+c = 0 and abc = 78. What is the value of (a+b)(b+c)(c+a)?

djyliett [7]

Answer:

$(a+b)(b+c)(c+a)=-78$