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Scilla [17]
2 years ago
10

Determine the point of intersection between the lines with equations x+3y=5 and 3x−2y=26.

Mathematics
2 answers:
Marianna [84]2 years ago
7 0

Answer:

(8,-1)

Step-by-step explanation:

The point of intersection can be found out by solving the system of equations.

  1. x + 3y = 5
  2. 3x - 2y = 26

<u>Multiply</u><u> </u><u>(</u><u>1</u><u>)</u><u> </u><u>by </u><u>3 </u><u>:</u><u>-</u><u> </u>

→ 3 ( x + 3y ) = 5 × 3

→ 3x + 9y = 15

<u>Subtracting</u><u> </u><u>3(</u><u>1</u><u>)</u><u> </u><u>and </u><u>2</u><u> </u><u>:</u><u>-</u><u> </u>

→ 3x + 9y - 3x +2y = 15 - 26

→ 11y = -11

→ y = (-1)

<u>Put </u><u>it </u><u>in </u><u>1</u><u> </u><u>:</u><u>-</u>

→ x -3 = 5

→ x = 3 + 5

→ x = 8

<h3>Hence the point of intersection is (8,-1)</h3>
Zolol [24]2 years ago
4 0

Answer:

the ans is :

Step-by-step explanation:

First, it would be helpful to draw a quick sketch of the lines. It helps to visualize the problem.

To find the intersection point, we need to find the point where x and y are the same value in both equations.

The line equations:

6x+2y=26 ................... 1

2x+3y=18 ................... 2

Can be rearranged to the common line equation form: y = mx + c

y = 13 - 3x ................... 3

y = 6 - 2/3 x ................. 4

At the intersection point, y will be equal for both equations. So, we can set 3 equal to 4 and solve for x.

13- 3x = 6 - 2/3 x

13 = 6 + 3x - 2/3x ....... add 3x to both sides

13 = 6 + 2 1/3x ........ simplify

7 = 2 1/3 x ........ subtract 13 from both sides

7 = 7/3 x ......... multiply both sides by 3/7

3 = x

To calculate the y-coordinate substitute x = 3 into 3.

y = 13 - 3x

y = 13 - 3(3)

y = 4

To check your answer, substitute the values for x and y into the other equation, 4.

The point of intersection is (3,4).

If you drew a sketch of the problem, you should be able to see that this point of intersection makes sense.

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How far should he ride on each of the four days to reach his goal?

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2nd day: 12 miles

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Step-by-step explanation: As the problem says, x is the number of miles he rides on the first day. Let's start off with that.

1st day: x miles

He want to ride 1.5 times as far as he rode the day before... no 1.5 more, but 1.5 <em>times</em> as far as he rode the day before; you would multiply 1.5 with the previous day's length.

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Then you multiply 1.5 to 1.5x to get the third day's.

3rd day: 2.25x

4th day: 3.375x

----------------------------

Phew! Gavin wants to ride a total of 65 miles over these four days, so if Gavin added all the miles of the four days, he should get 65...

1st+2nd+3rd+4th=65

x+1.5x+2.25x+3.375x=65

8.125x=65

\frac{8.125x}{8.125}=\frac{65}{8.125}

x=8

Yes! Now that we've got the hard part done... substitute 8 for ever single x.

1st day: 8 miles

2nd day: 1.5(8)=12 miles

3rd day: 2.25(8)=18 miles

4th day: 3.375(8)=27 miles

-------------------------

Checking my answer:

Just add the miles!

8+12+18+27=65

65=65

✓

-----------------------

Hope that helps! :D



5 0
2 years ago
Which equations show you how to find 16-9?
Setler79 [48]
I think it might be B
because from 9+1 = 10 we can change to 9=10-1
and 10+6=16 no need to change
then we solve the problem with the equation
16 - 9
10+6 - (10-1)
10+6-10+1
7
thats the answer




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