All categories

3 years ago

Solve the system x+3=22 2x-y=2

Mathematics

1 answer:

steposvetlana [31]3 years ago

3 0

Hello from MrBillDoesMath!

Answer:

x = 19, y = 36

Discussion:

x + 3 = 22 (*)

2x - y = 2 (**)

Subtract 3 from both sides of (*)

x + 3 -3 = 22 = 3 = 19 =>

x = 19

Substitute x= 19 in (**)

2(19) - y = 2 =>

38 - y = 2 => (add y to both sides)

38 -y + y = 2 + y =>

38 = 2 + y => (subtract 2 from both sides)

38 -2 = 2 -2 + y =>

36 = y

Regards,

MrB

P.S. I'll be on vacation from Friday, Dec 22 to Jan 2, 2019. Have a Great New Year!

You might be interested in

Pls help :))))))))) uhhhhhhhhh

Deffense [45]

The answers are 3 and -13

You need to plug 3 and -5 into x

By doing this, you get :

12 - 3^2 and

12 - (-5)^2

those expressions equal

12 - 9

12 - 25

So you get

-13

8 0

3 years ago

What is 11 x 15? plz help...

kicyunya [14]

Answer: 165.

Step-by-step explanation: You can multiply 11 by 15 to get 165. If that is too difficult, you can multiply 11 by 5 and 11 by 10 and add them. 11*5 is 55 and 11*10 is 110. 110 + 55 = 165.

4 0

3 years ago

Read 2 more answers

Gavin can count 10 numbers at a time.

Solnce55 [7]

18 would be the right answer

6 0

3 years ago

a boat takes 8 hours to go 6 miles upstream and come back to the starting point. if the speed of the boat is 4 miles per hour in

Romashka-Z-Leto [24]

Consider this option:
1. if to re-write the condition, it is given: total time t=8 hours; upstream=downstream=6 miles; V_boat=4 m/h., V_current=V=?
2. note, that total time=time_upstream+time_downstream, where time_upstream=6miles/(V_boat-V) and time_downstream=6miles/(V_boat+V). Using this it is possible to make up and solve the following equation:
$\frac{6}{4+V} + \frac{6}{4-V} =8; \ =\ \textgreater \ \ \frac{V^2-10}{16-V^2}=0; \ =\ \textgreater \ \ V=\sqrt{10} \ \frac{miles}{hour}$

answer: √10

P.S. the roots of the equation are √10 and (-√10), only positive values is needed for V.

7 0

3 years ago

1. Write the name of the properties:

faust18 [17]

Answer:

a) Commutative property of addition

b) Identity Property of Multiplication

c) Identity Property of Addition

d) Associative Property of Addition.

Step-by-step explanation:

6 0

1 year ago