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Veronika [31]
3 years ago
9

Y = 4x + 5 ; y = x - 4

Mathematics
1 answer:
liubo4ka [24]3 years ago
8 0

Answer:

(- 3, - 7 )

Step-by-step explanation:

Given the 2 equations

y = 4x + 5 → (1)

y = x - 4 → (2)

Substitute y = 4x + 5 into (2)

4x + 5 = x - 4 ( subtract x from both sides )

3x + 5 = - 4 ( subtract 5 from both sides )

3x = - 9 ( divide both sides by 3 )

x = - 3

Substitute x = - 3 into either of the 2 equations and evaluate for y

Substituting into (2)

y = x - 4 = - 3 - 4 = - 7

solution is (- 3, - 7 )

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If the base is 4, what is the value if the exponent is 2? What if the exponent is -2?
Vikentia [17]

Answer:

In the world of exponents, 4 is the number being raised by the exponent, which is 2.

Let's answer the first question:

If the base is 4, what is the value if the exponent is 2?

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4^2= 4*4 = 16

So, it would be 16.

Let's answer the second question:

What if the exponent is -2?

<u>This is the rule for negative exponents:</u>

a^{-x}=\frac{1}{a^x}

Using this rule, we can solve 4^{-2}.

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So, our answer for the 2nd question is 1/16.

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3 years ago
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7 0
3 years ago
What does -3/8 x 3/5 x -5/6 equal
allochka39001 [22]

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The table shows the battery life of four different mobile phones:
Pie

Answer:

A 20

Step-by-step explanation:

Given

Phone Battery Life (hours)

A 20

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4 0
3 years ago
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