3x + y = 8. -x - 2y = -10

1 answer:

5 0

Assumin we solving for the intersection or solution

elimination, ya

eliminate y's

multiply firs equation by 2 and add to 2nd

we get
6x+2y=16
<u>-x-2y=-10 +</u>
5x+0y=6

5x=6
divide both sides by 5
x=6/5

sub back
-x-2y=-10
-6/5-2y=-10
times both sides by 5
-6-10y=-50
add 6 to both sides
-10y=-44
divide both sides by -10
y=44/10
y=22/5

(x,y)
$(\frac{6}{5},\frac{22}{5})$
or
(1.2,4.4)

You might be interested in

I need all the help I can get!!!?

ratelena [41]

Answer:

Step-by-step explanation:

3 0

2 years ago

Oscar invests $20,000 in three investments earning 6% ,8% and 10%. He invests $9000 more in the 10% investment than in the 6% in

Hatshy [7]

This problem is mainly concerned with setting up an equation.

let's add the interest rates times their respective investment amounts:

$a = (9000 + x)0.10$

$b = x \times 0.06$

$c=(20000 - ((9000 + x) + x)) 0.08$

simplify:

$c = (11000 - 2x) \times 0.08$

sum of interest:

$1780 = a + b + c$

1780 = (9000+x) 0.10 + x 0.06 + (11000-2x)0.08

$1780 = 1780 + 0 \times x$

$0=0$

solution:

He does not have any invested in the 6%, while he has 9000 invested at 10% and 11,000 invested at 8%

to check:

$9000 \times 0.10 + 11000 \times 0.08$

$= 900 + 880 = 1780$

So this ended up being a trick problem because he does not actually have any invested in the 6% option.

6 0

3 years ago

What is x for y=mx+b

Hoochie [10]

Y and x are the variables

6 0

2 years ago

Someone help me?????

Vinvika [58]

Answer:

A. y = | x - 6 | - 3

Step-by-step explanation: