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3 years ago

13

Solve the system of linear equations by elimination.

2 answers:

Leona [35]3 years ago

6 0

The first x is 2 and the second x is 2,1

lilavasa [31]3 years ago

4 0

x+y=3
+ x-y=1
2x=4
x=2

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

(2,1)

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Which is the same as moving the decimal point 3 places to the right in a<br> decimal number?

BartSMP [9]

Multiplying the number by 1,000

4 0

3 years ago

in a AP the first term is 8,nth term is 33 and sum to first n terms is 123.Find n and common difference

allsm [11]

I believe there is no such AP...

Recursively, this sequence is supposed to be given by

$\begin{cases}a_1=8\\a_k=a_{k-1}+d&\text{for }k>1\end{cases}$

so that

$a_k=a_{k-1}+d=a_{k-2}+2d=\cdots=a_1+(k-1)d$

$a_n=a_1+(n-1)d$

$33=8+(n-1)d$

$21=(n-1)d$

$n$ has to be an integer, which means there are 4 possible cases.

Case 1: $n-1=1$ and $d=21$ . But

$\displaystyle\sum_{k=1}^2(8+21(k-1))=37\neq123$

Case 2: $n-1=21$ and $d=1$ . But

$\displaystyle\sum_{k=1}^{22}(8+1(k-1))=407\neq123$

Case 3: $n-1=3$ and $d=7$ . But

$\displaystyle\sum_{k=1}^4(8+7(k-1))=74\neq123$

Case 4: $n-1=7$ and $d=3$ . But

$\displaystyle\sum_{k=1}^8(8+3(k-1))=148\neq123$

8 0

3 years ago

Graph the systems of equations. {2x+y=8 −x+2y=6 Use the Line tool to graph the lines.

Nitella [24]

Answer:

See attachment

Step-by-step explanation:

We want to graph the system

2x+y=8

-x+2y=6

Let us rewrite the lines in slope intercept form:

y=-2x+8

$y=\frac{1}{2}x+3$

The first line has a slope of -2 and a y-intercept of 8

The second line has a slope of 1/2 and a y-intercept of 3

We can no graph the lines as shown in the attachment.

3 0

3 years ago

(HELP ME I CANT) Find the length of sides of ∆OTP if O is the centre of the circle ,PT is the length of

Ostrovityanka [42]

Hey there mate :)

Please check the attached image for answer.

5 0

2 years ago

NEED HELP PLZ!!!!!!!!!!!!!

podryga [215]

Answer:

1st Option is correct

Step-by-step explanation:

Just keep adding 150 to see the results

8 0

3 years ago