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2 years ago

PLEASE I NEED HELP QUICKLY!!! Find the solution for the given system of equations in the form (x,y).

Mathematics

2 answers:

adelina 88 [10]2 years ago

4 0

Solution:

Note that:

Given equations: -x + y = 8 and 7x + 3y = -16

Solving the system of equations to find the value of x and y:

7(-x + y = 8)

7x + 3y = -16

-7x + 7y = 56

7x + 3y = -16

10y = 40
=> y = 40/10 = 4

Substituting the value of y into any equation to find the value of x:

7x + 3y = -16
=> 7x + 3(4) = -16
=> 7x + 12 = -16
=> 7x = -16 - 12
=> 7x = -28
=> x = -28/7 = -4

Putting the values in the form (x,y):

(x,y) ⇒ (x = -4,y = 4) ⇒ (-4,4)

Correct option is D.

goblinko [34]2 years ago

3 0

Answer:

(4, - 4)

Step-by-step explanation:

Given system:

-x + y = 8
7x + 3y = - 16

Multiply the first equation by 7 and add up the equations:

-7x + 7y + 7x + 3y = 7*8 - 16
10y = 40
y = 4

Find y:

-x + 4 = 8
-x = 4
x = - 4

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3 years ago

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2 years ago

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Answer:

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