All categories

3 years ago

Solve using substitution. x + 2y = 4 and –4x − 7y = –9

Mathematics

2 answers:

xxMikexx [17]3 years ago

4 0

Answer:

X=-10 y=7

Step-by-step explanation:

1) in first equation subtract 2y on both sides

X=4-2y

Substitute as "x" in the second equation:

-4(4-2y)-7y=-9

-16+8y-7y=-9

-16+y=-9

Y=7

Substitute y as 7 to get x)

X=4-2(7)

X=4-14

X=-10

Hope this helps

RSB [31]3 years ago

3 0

Step-by-step explanation:

Given

x + 2y = 4

x = 4 - 2y.......... equation 1

-4x -7y = - 9.......equation 2

Putting equation 1 in equation 2 

- 4 ( 4 - 2y) - 7y = - 9

-16 + 8y - 7y = -9

y = - 9 + 16

y = 7

Now 

x = 4 - 2* 7 = 8 - 7 = 1 

hope this helps. 

You might be interested in

Write the point-slope form of the equation for a line that passes through (6,-1) with a slope of 2

Vika [28.1K]

Answer: y + 1 = 2(x-6)

Step-by-step explanation:

Point Slope Form is y-y₁=m(x-x₁), and all you have to so is substitute in the values that you were given. So, the slope is 2, so you substitute that value in for m. Then, you substitute 6 in for x₁ (because 6 is the x value of the coordinate you were given) and you substitute -1 for y₁ (and it becomes positive because two negatives make a positive)

Hope this was helpful! Please feel free to ask me any questions!

3 0

3 years ago

Read 2 more answers

A researcher posts a magazine advertisement offering $24 in exchange for participation in a short study. The researcher accepts

Mars2501 [29]

Commons

“How did Faulkner pull it off?” is a question many a fledgling writer has asked themselves while struggling through a period of apprenticeship like that novelist John Barth describes in his 1999 talk "My Faulkner." Barth “reorchestrated” his literary heroes, he says, “in search of my writerly self... downloading my innumerable predecessors as only an insatiable green apprentice can.” Surely a great many writers can relate when Barth says, “it was Faulkner at his most involuted and incantatory who most enchanted me.” For many a writer, the Faulknerian sentence is an irresistible labyrinth. His syntax has a way of weaving itself into the unconscious, emerging as fair to middling imitation.

While studying at Johns Hopkins University, Barth found himself writing about his native Eastern Shore Maryland in a pastiche style of “middle Faulkner and late Joyce.” He may have won some praise from a visiting young William Styron, “but the finished opus didn’t fly—for one thing, because Faulkner intimately knew his Snopses and Compsons and Sartorises, as I did not know my made-up denizens of the Maryland marsh.” The advice to write only what you know may not be worth much as a universal commandment. But studying the way that Faulkner wrote when he turned to the subjects he knew best provides an object lesson on how powerful a literary resource intimacy can be

7 0

3 years ago

Order these numbers from least to greatest.

Radda [10]

6.1. 6.1091 6.809 6.89.

5 0

3 years ago

Read 2 more answers

Members of a soccer team raised $2303 to go to a tournament. They rented a bus for

yKpoI14uk [10]

Answer: I believe this answer would be around 12 because I'm pretty sure you would have to divide but if you divide them you can get the right answer. or even multiple the number until you get to 776.50!

Step-by-step explanation: ::::::::::))))))))))

7 0

3 years ago

Solve the equation. If necessary, round to the nearest tenth.

ludmilkaskok [199]

Answer:

Your answer for this is =1±√2

Step-by-step explanation:

Hope this is helpful :)

6 0

3 years ago

Read 2 more answers