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3 years ago

Help please thank you

Mathematics

2 answers:

ololo11 [35]3 years ago

4 0

X = 90 degrees bc it is at a right angel

alex41 [277]3 years ago

4 0

X - 90

It is a 90 degree angle then to find y is simple. A triangle equals 180 degrees. We know that one angle is 47 and one is 90.

So 90+47=137

180-137=43

so y=43

Hope that helps.

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Q8 Q3.) Solve the system by the substitution method.

inn [45]

Recall that $(x+y)^2=x^2+2xy+y^2$ . So we can add twice the first equation to the second one to get

$x^2+y^2+2xy=10+2\cdot3\iff(x+y)^2=16\implies x+y=\pm4$

Since $xy=3$ , we have $y=\dfrac3x$ $(x\neq0)$ so

$x+y=x+\dfrac3x=\pm4\implies x^2\mp4x+3=0$

If $x+y=4$ , then

$x^2-4x+3=(x-3)(x-1)=0\implies x=3,x=1\implies y=1,y=3$

If $x+y=-4$ , then

$x^2+4x+3=(x+1)(x+3)=0\implies x=-1,x=-3\implies y=-3,y=-1$

So the solution set is

$(x,y)\in\{(-3,1),(1,3),(-1,-3),(-3,-1)\}$

3 0

3 years ago

Find the simplest interest. principal = $870 interest rate = 3% time = 9 months

JulsSmile [24]

Answer: $889.58

Step-by-step explanation:

⇒<u>Equation:</u>

A = P(1 + rt)

Turn 3% into decimal and you get 0.03, then 9 months/ 12 months = 0.75 years.

⇒A = 870(1 + (0.03 × 0.75)) = 889.575

⇒A = $889.58

* Hopefully this helps:) Mark me the brainliest:) !!!!

8 0

3 years ago

the equation of the line 3/5x+1/3x=1/15 the x-intercept of the line is ___ and it’s y-intercept is__?

finlep [7]

Answer:

Y-intercept is (0,1/15)

X-intercept is (1/14,0)

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3 years ago

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AURORKA [14]

Answer:

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Step-by-step explanation:

Hope this helps!!!

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3 years ago

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blagie [28]

I think x= 70 rights

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3 years ago