All categories

3 years ago

Eight times a number plus five times another number is -13. The sum of the number is 1. What are the nymber?

Mathematics

1 answer:

azamat3 years ago

7 0

Answer:

x=-6 y=7

Step-by-step explanation:

8x+5y=-13; x+y=1

Isolate x and substitute

(-13-5y)/8 +y=1

Isolate y

y=7

substitute y=7

(-13-5*7)/8=-6

You might be interested in

Pls help me with this multiple choice !

lana66690 [7]

Answer:

Step-by-step explanation:

$\sin(60) = \frac{6 \sqrt{3} }{x} \\ x = \frac{6 \sqrt{3} }{ \sin(60) } = 12 \\ \tan(60) = \frac{6 \sqrt{3} }{y} \\ y = \frac{6 \sqrt{3} }{ \tan(60) } = 6$

8 0

3 years ago

PLEASE SHOW WORK OR EXPLAIN

timofeeve [1]

Answer:

Step-by-step explanation:

You must use the trigonometric function.

In this case, it will be tangent.

$tangent=\dfrac{opposite}{adjacent}$

We have

$\theta=38^o,\ opposite=r,\ adjacent=20$

$\tan38^\approx0.7813$

Substitute:

$\tan38^o=\dfrac{r}{20}$

$\dfrac{r}{20}=0.7813$ <em>multiply both sides by 20</em>

$r=15.626$

Tree height is r + 5.

Therefore

$r+5=15.626+5=20.626\approx20.6\ ft$

7 0

3 years ago

Please help me out for a brainlist :)

Nadya [2.5K]

Answer:

1,2,3,2,2

Step-by-step explanation:

because standard form is ax

7 0

3 years ago

Patty’s gymnastics class is 5/6 of an hour long. Patty practices five different skills and spends the same amount of time on eac

s344n2d4d5 [400]

Answer:

10 minutes

Step-by-step explanation:

5/6 of an hours is 50 min. Assume x is the time she spends on each skill.

5x=50

x=10

4 0

3 years ago

Which of the following ordered pairs is a solution of the equation y = -4x². Can someone help me solve it. Could you guys also e

RUDIKE [14]

Answer:

graph{3x [-10, 10, -5, 5]}

Explanation:

this function is in the form of

with

so it's an straight line: ascending [

], that touch the

axis in the point

(

)

[

]

4 0

3 years ago