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3 years ago

3x+2y= -19 solve by elimination of addition -3x-5y= 25

Mathematics

2 answers:

tensa zangetsu [6.8K]3 years ago

8 0

Answer:

x=-5, y=-2

Step-by-step explanation:

3x+2y= -19

-3x-5y= 25

Add the two equations together

3x+2y= -19

-3x-5y= 25

------------------

0x -3y = 6

Divide each side by -3

-3y/-3 = 6/-3

y = -2

Now find x

3x+2y = -19

3x +2(-2) =-19

3x-4 = -19

Add 4 to each side

3x -4+4 = -19+4

3x= -15

divide by 3

3x/3 = -15/3

x = -5

solong [7]3 years ago

5 0

Answer:

x = -5, y = -2

Step-by-step explanation:

3x + 2y = -19

-3x - 5y = 25

Add both equation together.

3x + 2y = -19
+ -3x - 5y = 25
0 x -3y = 6
-3y = 6

Divide each side by -3.

-3y/-3 = 6/-3
y = -2

Now, find x.

Substitute the value of y into the equation 3x + 2y = -19

3x + 2( -2 ) = -19
3x - 4 = - 19

Move the constant to the right hand side and change their sign.

3x = -19 + 4
3x = -15

Divide both side by 3.

3x / 3 = -15 / 3
x = -5

Therefore, x = -5 and y = -2

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