1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
pickupchik [31]
3 years ago
13

what is the equation of a line passing through (1,-4) and (-2,5)? please help! i will mark brainliest

Mathematics
2 answers:
Natasha_Volkova [10]3 years ago
6 0

Answer:

m=-3

Step-by-step explanation:

bekas [8.4K]3 years ago
6 0

Answer:

y = -3x - 1

Step-by-step explanation:

The slope of a line is a measure of how fast the line "goes up" or "goes down". A large slope means the line goes up or down really fast (a very steep line). Small slopes means the line isn't very steep. A slope of zero means the line has no steepness at all; it is perfectly horizontal.

For lines like these, the slope is always defined as "the change in y over the change in x" or, in equation form:

So what we need now are the two points you gave that the line passes through. Let's call the first point you gave, (1,-4), point #1, so the x and y numbers given will be called x1 and y1. Or, x1=1 and y1=-4.

Also, let's call the second point you gave, (-2,5), point #2, so the x and y numbers here will be called x2 and y2. Or, x2=-2 and y2=5.

To find b, think about what your (x,y) points mean:

(1,-4). When x of the line is 1, y of the line must be -4.

(-2,5). When x of the line is -2, y of the line must be 5.

Because you said the line passes through each one of these two points, right?

Now, look at our line's equation so far: y=-3x+b. b is what we want, the -3 is already set and x and y are just two "free variables" sitting there. We can plug anything we want in for x and y here, but we want the equation for the line that specfically passes through the two points (1,-4) and (-2,5).

So, why not plug in for x and y from one of our (x,y) points that we know the line passes through? This will allow us to solve for b for the particular line that passes through the two points you gave!.

You can use either (x,y) point you want..the answer will be the same:

(1,-4). y=mx+b or -4=-3 × 1+b, or solving for b: b=-4-(-3)(1). b=-1.

(-2,5). y=mx+b or 5=-3 × -2+b, or solving for b: b=5-(-3)(-2). b=-1.

See! In both cases we got the same value for b. And this completes our problem.

You might be interested in
Determine the equation of the line, written in slope-intercept form, that passes through the points (1,1) and (5,−1).
bazaltina [42]

Answer:

y=-1/2x+3/2

Step-by-step explanation:

m=(y2-y1)/(x2-x1)

m=(-1-1)/(5-1)

m=-2/4

m=-1/2

y-y1=m(x-x1)

y-1=-1/2(x-1)

y=-1/2x+1/2+1

y=-1/2x+1/2+2/2

y=-1/2x+3/2

3 0
3 years ago
A jogger is running home. his distance from home, as a function of time, is modeled by y=-7+8.
Dovator [93]

Answer:

y=1

Step-by-step explanation:

4 0
3 years ago
The wolf population of a park was 200 in the year 200. it increased by 20% from 200 to 2005. it then increased by 15% from 2005
leonid [27]
B
 is the anser to this
7 0
3 years ago
Read 2 more answers
I need help!!!<br><br> What is 25sin26=x?<br><br> plz help
Nadya [2.5K]

Answer:

the answer is 19.06396

Step-by-step explanation:

there is no need for further explanation because the equation is already balanced

5 0
3 years ago
Could you explain what the answer is and why? I am not sure of how to do this
lidiya [134]
D, because after being reflected onto itself or turning 180 degrees, you would be transforming onto itself. I hope this helps!
8 0
3 years ago
Read 2 more answers
Other questions:
  • Please answer CORRECT ANSWERS ONLY for a brainliest
    14·1 answer
  • What's the equation of the line with a slope of -3 (m=-3) that passes through (-1,2)
    7·1 answer
  • Which statement represents the simplified form of the given equation and correctly describes the solution?
    13·1 answer
  • What is the definition of square root?
    14·2 answers
  • Consider The Graph shown?
    11·1 answer
  • PLS HELP ASAP!!! I NEED HELP! GIVING OUT 20 PTS! &lt;33
    6·2 answers
  • In the diagram below ab parrell to cd what is the value of x​
    6·1 answer
  • Seven times a number minus the number is -48. Find the number.
    8·2 answers
  • Find the value of x. Write your answer in simplest form.<br> (82<br> The value of x is
    14·1 answer
  • I Need to know a or b is the answer to this question
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!