All categories

4 years ago

Solve by substitution: 2x-y = -5 -x+-y =10

Mathematics

2 answers:

Elenna [48]4 years ago

6 0

2x-y=-5
-x-y=10
3x=-15
x=-5
-10-y=-5
-y=-5+10
-y=5
y=-5
HOPE I HELPED!!!

vlabodo [156]4 years ago

3 0

{2x-y = -5 => -y=-5-2x /*(-1) y=2x+5
{-x+-y =10

Substitute y in the second equation:

-x-y=10

-x-(2x+5)=10

-x-2x-5=10

-3x-5=10 /+5

-3x=15 /:(-3)

x=-5

y=2x+5=2*(-5)+5=-10+5=-5

y=-5

Solution: (-5; -5)

You might be interested in

Need help pleaseee!!!!

vodomira [7]

Step-by-step explanation:

ggggggiioioire huewsddg asdggjhy

5 0

3 years ago

If Tanisha has $nbsp 100 100 to invest at 66% per annum compounded semiannuallysemiannually, how long will it be before she h

Oxana [17]

Answer:

time is 6.76 years

Step-by-step explanation:

given data

amount = $150

payment = $100

rate r = 6% = 0.06

to find out

time period t

solution

we know it is compounding continuous

so we will apply here formula that is

amount = payment × $e^{rt}$ ..........1

put here all value we get

amount = payment × $e^{rt}$

150 = 100 × $e^{0.06t}$

take ln both side

ln 1.5 = $e^{0.06t}$

0.40546 = 0.06t

t = 0.40546 / 0.06

t = 6.76

so time is 6.76 years

7 0

3 years ago

you have $18 to buy peppers. peppers cost $1.50 each. write and solve an inequality that represents the number of peppers you ca

Nezavi [6.7K]

At most 12 peppers can be bought with $18

Step-by-step explanation:

Given

Total amount for peppers = $18

Cost per pepper = $1.50

Let p be the number of peppers that can be bought from $18 at $1.50 per pepper

So,

$1.50p\leq 18$

Dividing both sides by 1.50

$\frac{1.50p}{1.50}\leq \frac{18}{1.50}\\p\leq 12$

Hence,

At most 12 peppers can be bought with $18

Keywords: Inequality, solution

Learn more about inequalities at:

#LearnwithBrainly

5 0

3 years ago

A standard deck of playing cards has 52 cards total that contains 13 of each suit (hearts, diamonds, clubs and spades). What is

schepotkina [342]

Answer:

C 1/2

Step-by-step explanation:

There are 4 suits, 2 suits are red (hearts and diamonds) while 2 are black (clubs and spades)

Since 13 cards are in each suit, 26 cards are red ( 2 * 13)

There are 52 total cards

P (red) = red cards/ total cards

= 26 / 52

= 1/2

8 0

3 years ago

Is one sixth equivalent to two twelves

VikaD [51]

Answer:

Yes.

Step-by-step explanation:

2/12 can be reduced to 1/6

Hope this helps!

Please mark me as brainliest!

~Courtney

7 0

3 years ago