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Andrej [43]
2 years ago
15

9. ax + by = (a - b), bx - ay = (a + b)​

Mathematics
1 answer:
mart [117]2 years ago
8 0

Answer: give me brainliest

Step-by-step explanation:

ax+by=a-b

ax=a-b-by

x=a-b-by/a←

bx-ay=a+b

substituting

b(a-b-by/a)-ay=a+b

ab-b²-b²y/a-ay=a+b

ab-b²-b²y-a²y/a=a+b

ab-b²-(b²+a²)y=a²+ab

-(b²+a²)y=a²+ab-ab+b²

(b²+a²)y=-(a²+b²)

y=-(a²+b²)/a²+b²

y=-1←

substituting value of y

x=a-b-b(-1)/a

x=a-b+b/a

x=a/a

x=1

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8(19-17) number- number
STatiana [176]

Answer:

16

Step-by-step explanation:

8(19-17)=8(2)=16

7 0
3 years ago
All help is appreciated, thanks everyone in advance *Slopes :)
Katena32 [7]
This one is a bit more complicated but i believe the answer is -1/4

4 0
3 years ago
PLEASE HELP MY ASSIGNMENT IS DUE IN 3 HOURS!!!!
Hatshy [7]

Answer:

76.3 degrees

Step-by-step explanation:

We use inverse cosine to find the angle.

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7 0
3 years ago
I need help with this question to turn it into an equation. The question is
SVEN [57.7K]
Sure, here is how I broke it down. The bird is flying a constant X miles per hour with a wind speed of Y miles per hour. So, there are two equations that you use to solve. Here they are:

X+Y=12
X-Y=4

Now, you have to use substitution or elimination to solve (I will use elimination). To use elimination, you simply add both equations together to get:

2X=16
Solve for X by dividing by 2.

X=8. We already established that X is the speed of the bird. Plug X back into either of the equations to find the windspeed.

(8)+Y=12

Subtract 8 from both sides.

Y=4. We already established that Y is the windspeed.

So, the speed of the bird (X) is 8mph and the speed of the wind (Y) is 4mph.

Hope this helped!!
7 0
3 years ago
Which of the following points lie in the solution set to the following system of inequalities? y ≤ x − 5 y ≥ −x − 4
Strike441 [17]
Y ≤ x - 5
y ≥-x - 4

   x - 5 = -x - 4
+ x       + x
 2x - 5 = -4
     + 5  + 5
       2x = 1
        2     2
         x = ¹/₂
         y = x - 5
         y = ¹/₂ - 5
         y = -4¹/₂

The following points that lie in the solution set to the following system of inequalities is (¹/₂, -4¹/₂).
8 0
3 years ago
Read 2 more answers
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