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Deffense [45]
3 years ago
7

Joan is 5 years older than ellen, and 3 years ago the sum of their ages was 17 years. in how many years will joan be 21 years ol

d?
Mathematics
2 answers:
Annette [7]3 years ago
8 0

Answer:

In 7 Years

Step-by-step explanation:

Ellen's age = x

Joan's age = x + 5

3 Years ago

(x-3)+(x+5-3)=17

2x+5-6=17

2x=18

x=9

Hence Joan's age is 9+ 5 = 14

21 - 14 = 7

In 7 years Joan will be 21 years old

Anna11 [10]3 years ago
7 0
For this case, the first thing we must do is define variables.
 We have then:
 x: number of years of Joan y: number of years of ellen We now write the system of equations:
 y = x + 5

 (x-3) + (y-3) = 17
 Solving the system we have:
 x = 9

 y = 14
 So that Joan is 21 years old then:
 j + 9 = 21

 j = 21 - 9

 j = 12
 Answer:
 joan will be 21 years old in 12 years
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3 years ago
Find the ratio created when AB is partitioned by C.
Blizzard [7]

Answer:

Step-by-step explanation:

From the picture attached,

Segment AB has been divided into four equal parts.

Let each part measures equal length = 1 unit

Point C is 2 units apart from both the points A and B.

Length of AC = Length of BC = 2 units

Therefore, point C will be the mid point of segment AB.

And ratio of AC and BC = 1:1

AC:BC = 1:1

Similarly, AC:AB = 2:4

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And BC:AB = 2:4

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3 years ago
The equation of a line is y=-2x+1. What is the equation of the line that is parallel to the first line and passes through (2,2)?
Murrr4er [49]

Answer:

The equation in slope-intercept form is y=-2x+6.

The equation in standard form is 2x+y=6.

The equation in point-slope form is y-2=-2(x-2).

Step-by-step explanation:

The slope-intercept form of a line is y=mx+b where m is the slope and b is the y-intercept.

Parallel lines will have the same slope and different y-intercept.

Anyways the slope of y=-2x+1 is -2.

So the equation of our line we are looking for is -2.

So we know our equation is in the form y=-2x+b.

We must inf b using y=-2x+b with (x,y)=(2,2).

y=-2x  +b  with (x,y)=(2,2)

2=-2(2)+b

2=-4+b

Add 4 on both sides:

2+4=b

Simplify:

6=b

The equation is y=-2x+6.

Now it didn't say what form it wanted.

There are some forms I can give you like standard and point-slope form.

There is also general form but it is not too much different from standard form.

Standard form is ax+by=c where a,b, and c are integers if possible.

Point-slope form is y-y1=m(x-x1) where (x1,y1) is a point on the line and m is the slope.

So let's go for standard form (ax+by=c) first:

y=-2x+6

add 2x on both sides:

2x+y=6

This is standard form because it is in the form

ax+by=c.

Ok we know point (2,2) is on our line and we also know we have slope,m, is -2.

Point-slope form is

y-y1=m(x-x1)

y-2=-2(x-2)

8 0
3 years ago
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Hence, this is the required solution.

5 0
3 years ago
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kogti [31]

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