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2 years ago

( use elimination) on 3x+5y=12 and x-3y=4

Mathematics

1 answer:

Elena L [17]2 years ago

7 0

Answer:

x=4 y=0

Step-by-step explanation:

3x+5y=12

-(x-3y=4)

3x+5y=12

3(-x+3y=-4)

3x+5y=12

-3x+9y=-12

14y=0

y=0

Then, substitute the y into the equation to find x

x-3(0)=4

x=4

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Explanation

we need to use the formula:

$\begin{gathered} A=P(1+r)^t \\ \text{where} \\ \text{ P is the principal} \\ r\text{ is the rate ( in decimal)} \\ t\text{ is the time} \end{gathered}$

Step 1

a)let

$\begin{gathered} P=2500 \\ r=\text{ 4\% =}\frac{4}{100}=0.04 \\ r=0.04 \\ t=5\text{ ( years)} \end{gathered}$

b) now, replace

$\begin{gathered} A=P(1+r)^t \\ A=2500(1+0.04)^5 \\ A=2500(1.04)^5 \\ A=2500(1.2166) \\ A=3041.63 \\ \text{rounded} \\ A=3042 \end{gathered}$

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1 year ago

2(4t-2)+t=16-t solution set is

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3 years ago

Read 2 more answers

25. Which of the following is equivalent to: 7 2 x 7-4

MissTica

Answer:

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$\frac{1}{7^{2} }$

Step-by-step explanation:

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3 years ago

Find the x-values for which f(x) = g(x)<br> if you know that f(x) = x2 and g(x) = 2x.

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For this case we have the following functions:

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If we want $f (x) = g (x)$ then:

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We take common factor x:

$x (x-2) = 0$

Thus, the values of x that make equality equal are:

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ANswer:

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3 years ago

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sladkih [1.3K]

Answer:

$(x,y) = (0,7)$

$(x,y) = (3,7)$

Step-by-step explanation:

The question and the attached image are different. However, the attached image answers the question y = -4 correctly.

So, I will solve for: $y = -x + 7$

Given

$y = -x + 7$

Required

Possible values of x and y

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So, we have:

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<em>So, all you need to do is: assume a value for either x or y, then solve for the other variable.</em>

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