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3 years ago

FOR BRAINLIEST ANSWER ONLY: 2. 3. 4. 6.

Mathematics

1 answer:

nasty-shy [4]3 years ago

6 0

Answer:

2. x = 2 & y = 4

3. x = 4 & y = 2

Step-by-step explanation:

2. x + y = 6

2x + y = 8 (multiply the first equation by -1, so you can eliminate the ys)

- x - y = -6

2x + y = 8 (now add the variables together)

x = 2 (plug in x in one of the equations to find out y)

x + y = 6

(2) + y = 6

-2 -2

y = 4

3. 3x + y = 14

x = 2y (plug in x into the first equation and solve it for y)

3(2y) + y = 14

6y + y = 14

7y = 14

y = 2 (plug in y in one of the equations to find out x)

x = 2y

x = 2(2)

x = 4

4. One number (x) is 2 more (+2) than twice (times 2) as large as another. their sum is 17. Find the numbers.

2x + 2 = 17 (solve for x)

-2 -2

2x = 15

x = 7.5

6. 7 (4x + 1) - (x + 6) (start by distributing 7 into the first parenthesis)

(28x + 7) - (x + 6) (do the same to the other parenthesis by distributing -1)

(28x + 7) (-x - 6) (and now just combine like terms)

28x + 7 - x - 6

28x - x + 7 - 6

27x + 1

i hope this helped! if you have any question, pls let me know!

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