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Nostrana [21]
3 years ago
7

Consider the system of equations.

Mathematics
1 answer:
jok3333 [9.3K]3 years ago
6 0

Given:

The system of equations:

x-3y=9

\dfrac{1}{5}x-2y=-1

To find:

The number that can be multiplied by the second equation to eliminate the x-variable when the equations are added together.

Solution:

We have,

x-3y=9                        ...(i)

\dfrac{1}{5}x-2y=-1       ...(ii)

The coefficient of x in (i) and (ii) are 1 and \dfrac{1}{5} respectively.

To eliminate the variable x by adding the equations, we need the coefficients of x as the additive inverse of each other, i.e, a and -a So, a+(-a)=0.

It means, we have to convert \dfrac{1}{5} into -1. It is possible if we multiply the equation (ii) by -5.

On multiplying equation (ii) by -5, we get

-x+10y=5       ...(iii)

On adding (i) and (iii), we get

7y=14

Here, x is eliminated.

Therefore, the number -5 can be multiplied by the second equation to eliminate the x-variable.

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Write the equations of 2 straight lines which are perpendicular to y = -3x +0.5.
olchik [2.2K]

Answer:

y = (1/3)x + 7

y = (1/3)x - 15

These are two examples out of an unlimited number of possibilities.

Step-by-step explanation:

The slope of this given line is -3.  Any new line perpendicular to this one is the negative reciprocal of -3:  1/3.

The slope-intercept form is y = mx + b.  Here m = 1/3, so the revised form is

y = (1/3)x + b.

Two straight lines perpendicular to the given line are easily found by selecting two different values for b:

y = (1/3)x + 7

y = (1/3)x - 15

3 0
2 years ago
The height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. When graphed,
nydimaria [60]

Answer:

  13.6 cm

Step-by-step explanation:

The slope of -0.6 tells you the change in height in 7 hours will be ...

  (-0.6 cm/h) · (7 h) = -4.2 cm

This is added to the candle height after 12 hours, so the height after 19 hours is ...

  17.8 cm -4.2 cm = 13.6 cm

5 0
3 years ago
98 Points! Answer Quick!
timama [110]

Reason:

2. SD ⊥ HT. ∴ ∠SDH = ∠SDT =90°

3. Given (It is given in the question)

5. RHS congruence

(Here, the right angle, hypotenuse and one side of ΔSHD is congruent to that of ΔSTD).

Statement:

4. Line segment SD = SD

(Reflexive property is used to prove congruence of triangles. This property is used when an angle or line segment is congruent to itself.)


7 0
3 years ago
Read 2 more answers
The diagram below is divided into equal parts.which fraction of the parts is white?
LenaWriter [7]

Answer:

no diagram

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Need some help on this. any help is appreciated :) !!
kirza4 [7]

If we think about a normal curve / bell curve and the 68-95-99.7 rule, we know that the majority of data will lie within 1, 2, or 3 standard deviations from the mean. The mean is in the center of the curve, and to each side of the mean, 34% of the data lies 1 standard deviation on either side of the mean. Therefore, we need to add and subtract one standard deviation from the mean.

85 + 12 = 97

85 - 12 = 73

Correct Answer: B. 73 - 97

Hope this helps!! :)

7 0
3 years ago
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