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Sonja [21]
3 years ago
7

Working out simultaneous equations 3x - 4y = 11 5x + 6y =12​

Mathematics
1 answer:
igomit [66]3 years ago
8 0
Firstly, label the eqns.

3x - 4y = 11 — (1)
5x + 6y = 12 — (2)

lets say that we want to eliminate x from the equation.

from (1):
3x-4y=11
15x-20y=55 — (3)

from (2):
5x+6y=12
15x+18y=36 — (4)

( make 15x the common variable )
so, ( 3 ) - ( 4 ) :
( 15x -20y ) - ( 15x+18y ) = 55 - 36
15x - 20y - 15x + 18y = 19
-2y = 19
-y = 9.5
y = -9.5
now that we know the value of y,
sub y = -9.5 into (1)
3x - 4(-9.5) = 11
3x + 38 = 11
3x = 11 - 38
x = -9

thus, x = -9, y = -9.5
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Raven is considering taking out a 30-year loan with monthly payments of
Anna007 [38]

Answer:

If Raven's monthly payment were $125, the amount of the loan that she is considering taking out  would be less than $43,205.56.

Step-by-step explanation:

If you think about it this way it may be more simple. If the APR stays constant then a greater payment will result in a greater loan. The opposite is also true meaning a lesser payment will result in a lesser loan. If the amount Raven pays is greater than $145 then the loan will be greater than $43,205.56. If the amount she pays is less than $145 then the loan will be less than $43,205.56. Of the options, only one of these situations will be present. In my case, the correct option was a payment of $125 will result in a lesser loan than $43,205.56.

6 0
3 years ago
What is the 7th term of the geometric sequence where a1 = -625 and a2 = 125
kykrilka [37]
Since the sequence is geometric, there is some constant r such that the sequence is recursively given by

a_n=ra_{n-1}

By this definition, you can recursively substitute into the right hand side the definition for a_{n-1},a_{n-2},\ldots to find an explicit formula for the nth term.

a_n=ra_{n-1}=r^2a_{n-2}=r^3a_{n-3}=\cdots=r^{n-1}a_1=-625r^{n-1}

You know the second term, which means you can find r:

a_2=-625r^{2-1}\implies125=-625r\implies r=-\dfrac15

So, the 7th term of the sequence is

a_7=-625\left(-\dfrac15\right)^{7-1}=-\dfrac1{25}
8 0
3 years ago
Find value of x <br> How do I find the solution to this?
SashulF [63]
Adding all of these should equal to 180 from the way the angle is set up.

So the equation should be:

(3x + 2) + (2x + 5) + (2x - 9) = 180

You can remove parentheses as it doesn’t affect the equation since it is all addition.

Let’s first add the common variables together.

3x + 2x + 2x = 7x
2 + 5 + (-9) = -2

So now we should have:

7x - 2 = 180

Now add 2 to both sides.

7x = 182

Divide both sides by 7 to isolate x.

x = 26

So x is 26.
3 0
3 years ago
Read 2 more answers
If mc010-1.jp g and mc010-2.jp g, which expression could be used to verify that mc010-3.jp g is the inverse of mc010-4. ? mc010-
solmaris [256]

if indeed two functions are inverse of each other, then their composite will render a result of "x", namely, if g(x) is indeed an inverse of f(x), then

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5 0
3 years ago
What is the equation for y=-x+6 of X and Y?<br> -6, -3, 2, 4, 7
Ann [662]
Y=-x+6
Try -6 on X, -(-6)+6=12... wrong
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Try 4 on X, -4+6=2... correct, you got X=4, Y=2
Try 7 on X, -7+6=1... wrong
7 0
3 years ago
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