radomes.openskiesproject.org
dazaiosamu dazaiosamu
  • 14-02-2017
  • Mathematics
Answered

Solve these using elimination.


1)

x = 5 - 9y

4x + 9y = -7


2)

3x = 5y - 9

2y = 3x + 3


3)

10x - 5 = 3y

2x - 3y = 1


4)

-6x - 4y = 10

-12x - y = 13

Verified Answer :

Tms1739
Tms1739 Tms1739
  • 14-02-2017

1) x+9y=5 ------equation 1
4x+9y=-7 -------equation 2
equation 1-equation 2
(x+9y)-(4x+9y)=5-(-7)
x+9y-4x-9y=12
-3x=12
x=-4
sub x=-4 into equation 1
-4+9y=-7
9y=-7+4
y=-1/3
2) 3x-5y=-9----e1
2y-3x=3----e2
e1+e2
(3x-5y)+(2y-3x)= -9+3
3x-5y+2y-3x=-6
-3y=6
y=-2
sub y =-2 into e1
3x-5(-2)=-9
3x=-9-10
x=19/3
=6 1/3

Answer Link
hay71486
hay71486 hay71486
  • 21-05-2021

Answer:

c

Step-by-step explanation:

Answer Link

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