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Nikitich [7]
3 years ago
13

Solve the system using elimination. | 3x – 5y = 7 5x - 2y =-1

Mathematics
2 answers:
Licemer1 [7]3 years ago
6 0

Answer:

(-1, -2)

Step-by-step explanation:

multiply the top equation by 5

multiply the bottom equation by 3

15x - 25y = 35

15x - 6y = -3

subtract these two - x values cancel

-25 y = 35

6 y  = 3

-19y = 38

y = -2

plug this back in to get x

15x + 12 = -3

15x = -15

x = -1

stich3 [128]3 years ago
3 0

Answer:

yea girl i need to know dat answer too cuz my teacher thank im Houdini

Step-by-step explanation:

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4 0
3 years ago
Write the equation for:
xenn [34]

Answer:

\frac{1}{2} x +x = 2 (x-4)

Step-by-step explanation:

Suppose number is x

Following equation can be written from question statement

\frac{1}{2} x +x = 2 (x-4)

Simplifying it further

\frac{3}{2} x = 2x-8

\frac{3}{2} x -2x=-8

\frac{3x-4x}{2}= -8

-x= -16\\x=16

7 0
2 years ago
2ND TIME REPOST
Mars2501 [29]
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6 0
3 years ago
2x+5y=-3<br>3x-y=21<br>help me
arlik [135]
Problem:
Solve
2
x
+
5
y
=
−
3
;
3
x
−
y
=
21
Steps:
I will try to solve your system of equations.
3
x
−
y
=
21
;
2
x
+
5
y
=
−
3
Step: Solve
3
x
−
y
=
21
for y:
3
x
−
y
+
−
3
x
=
21
+
−
3
x
(Add -3x to both sides)
−
y
=
−
3
x
+
21
−
y
−
1
=
−
3
x
+
21
−
1
(Divide both sides by -1)
y
=
3
x
−
21
Step: Substitute
3
x
−
21
for
y
in
2
x
+
5
y
=
−
3
:
2
x
+
5
y
=
−
3
2
x
+
5
(
3
x
−
21
)
=
−
3
17
x
−
105
=
−
3
(Simplify both sides of the equation)
17
x
−
105
+
105
=
−
3
+
105
(Add 105 to both sides)
17
x
=
102
17
x
17
=
102
17
(Divide both sides by 17)
x
=
6
Step: Substitute
6
for
x
in
y
=
3
x
−
21
:
y
=
3
x
−
21
y
=
(
3
)
(
6
)
−
21
y
=
−
3
(Simplify both sides of the equation)
Answer:
y
=
−
3
and
x
=
6

7 0
3 years ago
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