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vladimir2022 [97]
3 years ago
11

PLEASE HELP ASAP 35 POINTS NEED HELP ON HOMEWORK

Mathematics
1 answer:
klasskru [66]3 years ago
7 0

Answer:

(-1,2)

Step-by-step explanation:

To find the solution, we need to substitute in the points into the equation

5x-2y = -9

(1,-3)

5(1) -2(-3) = -9

5 +6=-9

11 =-9

This is not true so this is not a solution


5x-2y = -9

(2,-4)

5(2) -2(-4) = -9

10 +8 = -9

18 =-9

This is not true so this is not a solution


5x-2y = -9

(-1,2)

5(-1) -2(2) = -9

-5 -4 = -9

-9=-9

This is true so this is a solution


5x-2y = -9

(-2,5)

5(-2) -2(5) = -9

-10-10 = -9

-20=-9

This is not true so this is not a solution

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2 years ago
All questions to be solved using linear combination.
monitta
1)
I:x-y=-7
II:x+y=7

add both equations together to eliminate y:
x-y+(x+y)=-7+7
2x=0
x=0

insert x=0 into II:
0+y=7
y=7

the solution is (0,7)

2)
I: 3x+y=4
II: 2x+y=5

add I+(-1*II) together to eliminate y:
3x+y+(-2x-y)=4+(-5)
x=-1

insert x=-1 into I:
3*-1+y=4
y=7

the solution is (-1,7)

3)

I: 2e-3f=-9
II: e+3f=18

add both equations together to eliminate f:
2e-3f+(e+3f)=-9+18
3e=9
e=3

insert e=3 into I:
2*3-3f=-9
-3f=-9-6
-3f=-15
3f=15
f=5

the solution is (3,5)

4)
I: 3d-e=7
II: d+e=5

add both equations together to eliminate e:
3d-e+(d+e)=7+5
4d=12
d=3

insert d=3 into II:
3+e=5
e=2

the solution is (3,2)

5)
I: 8x+y=14
II: 3x+y=4

add I+(-1*II) together to eliminate y
8x+y+(-3x-y)=14-4
5x=10
x=2

insert x=2 into II:
3*2+y=4
y=4-6
y=-2

the solution is (2,-2)
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3 years ago
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