4 years ago

-9x +y =17 9x + 9y=19 solve for y equation 1

Mathematics

1 answer:

Ksivusya [100]4 years ago

6 0

-9x + y = 17
9x + 9y = 19
------------------add
10y = 36
y = 36/10 = 18/5 <==

You might be interested in

The length and width of a rectangle are measured as 31 cm and 28 cm, respectively, with an error in measurement of at most 0.1 c

MissTica

Answer:

$\Delta A = 5.9\,cm^{2}$

Step-by-step explanation:

The area of an rectangle is given by the following formula:

$A = w\cdot h$

Where:

$w$ - Width, in centimeters.

$h$ - Height, in centimeters.

The differential of the expression is derived hereafter:

$\Delta A = \frac{\partial A}{\partial w} \cdot \Delta w + \frac{\partial A}{\partial h}\cdot \Delta h$

$\Delta A = h \cdot \Delta w + w \cdot \Delta h$

$\Delta A = (31\,cm)\cdot (0.1\,cm) + (28\,cm)\cdot (0.1\,cm)$

$\Delta A = 5.9\,cm^{2}$

5 0

3 years ago

A right rectangular prism is shown. Find the surface area of this prism. A) 80 square feet B) 164 square feet C) 196 square feet

WITCHER [35]

It would be better if you put a picture next time but i’ll just cauclate a normal rectangle to get the normal answer which is C) 196 square ft

6 0

3 years ago

Read 2 more answers

If sin Θ = 2 over 3 and tan Θ < 0 , what is the value of cos Θ?

Zielflug [23.3K]

$\sin \theta = \dfrac 2 3$

$\tan \theta < 0$

Positive sine, negative tangent, means we have a negative cosine. We're talking about the second quadrant.

$\cos^2 \theta + \sin ^2 \theta = 1$

$\cos^2 \theta = 1 - \sin ^2\theta$

$\cos \theta = \pm \sqrt{1 - \sin ^2\theta}$

We know it's negative,

$\cos \theta = - \sqrt{1 - (2/3)^2} =-\sqrt{5/9} = - \dfrac 1 3 \sqrt{5}$

Answer: -(1/3)√5

4 0

3 years ago

Use the formula for perimeter. P=/+w+/+w P=_+_+_+_ P=_+_+_ P=__+_ P=__units

STALIN [3.7K]

1.A(rea)
2.W(idth)
3.W(idth)
4.P(erimeter)
5.A(rea)
6.A(rea)
7.W(idth)
8.A(rea)
The rest is perimeter

7 0

3 years ago

a rectangle measuring 4m by 8m. a similar rectangle has a side measurement of 40 m. what is the other side measurement of the la

goblinko [34]

Answer: 80m

Step-by-step explanation:

5 0

3 years ago