Ask question

Ask question

All categories

3 years ago

10

Please help??! Solve by elemination 4x + y = 612x + 3y = 18Show your work

1 answer:

RUDIKE [14]3 years ago

8 0

Multiply -3[4x+y=6].
This gets you -12x-3y=-18.
Add the two equations together to eliminate the y.
-12x - 3y = -18
+ 12x + 3y = 18
------------------------
0 = 0
This means that these are in fact the same line, therefore there are infinite solutions.

You might be interested in

Ian has the choice of taking out a 25-year loan for $205,000 at 3.2% interest, compounded monthly, or the same loan at 20 years

PolarNik [594]

B. Less than $93,077

4 0

2 years ago

Read 2 more answers

Wayne types about 50 words per minute.A typical double spaced page contains 500 words.how long doe sit take Wayne to type 8 1/2

Katarina [22]

Answer:

Step-by-step explanation:

50t=500(8.5)

t=10(8.5)

t=85 minutes

3 0

2 years ago

Read 2 more answers

I need help...........

bogdanovich [222]

Hello,

The answer is C, refer to this picture for an explanation.
Have a great day!!
Brainliest??

4 0

2 years ago

Evaluate this exponential expression. 3 • (5 + 4)2 – 42 = A. 345 B. 15 C. 227 D. 46

LUCKY_DIMON [66]

The answer is C. 227

5 0

3 years ago

2. Determine the sum of the first 400 ODD numbers.<br><br>

il63 [147K]

Odd numbers take the form $2n-1$ , where $n\ge1$ is an integer. When $n=400$ , the last odd number would be 799. So we're adding

$S=1+3+5+\cdots+795+797+799$

By reversing the order of terms, we have

$S=799+797+795+\cdots+5+3+1$

and we can pair up terms in both sums at the same position to write

$2S=(1+799)+(3+797)+(5+795)+\cdots(795+5)+(797+3)+(799+1)$

so that we are basically adding 400 copies of 800, and from there we can find the value of the sum right away:

$2S=400\cdot800\implies S=160,000$

###

We could also make use of the formulas,

$\displaystyle\sum_{i=1}^n1=n$

$\displaystyle\sum_{i=1}^ni=\dfrac{n(n+1)}2$

We have

$S=\displaystyle\sum_{i=1}^{400}(2i-1)=2\sum_{i=1}^{400}i-\sum_{i=1}^{400}1=400(400+1)-400=400^2=160,000$

3 0

3 years ago