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3 years ago

X-y = -10 2x+4y=22 substitution

Mathematics

1 answer:

Tema [17]3 years ago

4 0

Answer:

[1] x - 4y = 22

[2] 2x + 5y = -21

Step-by-step explanation:

Solve equation [1] for the variable x

[1] x = 4y + 22

// Plug this in for variable x in equation [2]

[2] 2•(4y+22) + 5y = -21

[2] 13y = -65

// Solve equation [2] for the variable y

[2] 13y = - 65

[2] y = - 5

// By now we know this much :

x = 4y+22

y = -5

// Use the y value to solve for x

x = 4(-5)+22 = 2

I am sorry if I get it wrong.

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1 year ago

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3 years ago

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Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Geometry

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Calculus

Derivatives

Derivative Notation

Differentiating with respect to time

Basic Power Rule:

f(x) = cxⁿ
f’(x) = c·nxⁿ⁻¹

Step-by-step explanation:

Step 1: Define

$l = 30 \ cm\\w = l\\\frac{dl}{dt} = 2 \ cm/h\\h = 20 \ cm\\\frac{dh}{dt} = 3 \ cm/h$

Step 2: Differentiate

Rewrite [VRP]: $V = l^2h$
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Step 3: Solve for Rate

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Here this tells us that our volume is decreasing (ice melting) at a rate of 360 cm³ per hour.

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