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3 years ago

Solve the equation -4x + 7 y equals 20. Y=3x+15

Mathematics

1 answer:

satela [25.4K]3 years ago

3 0

Substitue what y equals for y and solve.

$-4x+7(3x+15)=20 \\-4x+27x+105=20 \\23x=-85 \\x=-\boxed{\frac{85}{23}}$

Hope this helps.

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34x−5=4 x = <br> im confused

IRINA_888 [86]

Answer:

9/34

Step-by-step explanation:

Let us move all the numerical values to one side:

34x= 4+5

34x = 9

x=9/34

<em>I hope this helps! :)</em>

8 0

3 years ago

Identify the values of the variables. Give your answers in simplest radical form. PLEASE HELP!!

Talja [164]

First question:

By definition of sine and cosine, we have

$\sin30^\circ=\dfrac h{\sqrt5}\implies h=\dfrac{\sqrt5}2$

$\cos30^\circ=\dfrac g{\sqrt5}\implies g=\dfrac{\sqrt{15}}2$

Second question:

By definition of tangent, we have

$\tan60^\circ=\dfrac{5\sqrt2}x\implies x=\dfrac{5\sqrt2}{\sqrt3}=\dfrac{5\sqrt6}3$

Then by Pythagoras' theorem,

$(5\sqrt2)^2+x^2=y^2\implies y=\sqrt{(5\sqrt2)^2+\left(\dfrac{5\sqrt6}3\right)^2}=\sqrt{50+\dfrac{50}3}=\sqrt{\dfrac{200}3}=\dfrac{10\sqrt6}3$

3 0

4 years ago

1. Solve.

Len [333]

Answer:

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Step-by-step explanation:

It works

6 0

3 years ago

Is 3/8 equal to 4/10?

BaLLatris [955]

8ths are divided by 12.5 so 3 * 12.5 is 37.5
10ths are divided by 10 so 4 * 10 is 40

3/8 is < / = 4/10

3 0

3 years ago

Does anyone know to do this!

Rina8888 [55]

Answer: (r + 4)(r + 8)
Alright, I would first rearrange the equation by bringing all your terms to one side by adding 12r and 32 to both sides. This will result in the rearranged equation: $r^2+12r+32=0$
You can then factor the equation into the two binomials: (r + 4)(r + 8).
4 + 8 equals the b term, 12, and 4 x 8 equals the c term, 32.

3 0

3 years ago