7x-4y=18 4x+20y=27 solve e by elimination method Question 7x-4y=18 4x+20y=27 solve e by elimination method in progress 0 Math Claire 2 weeks 2021-09-07T22:54:38+00:00 2021-09-07T22:54:38+00:00 2 Answers 0

## Answers ( )

Answer:

x=2.14,y=0.75

Step-by-step explanation:

7x-4y=18..(1)

4x+20y=27…(2)

Multiply (1) by 4

28x-16y=72…(3)

Multiply (2) by 7

28x+140y=189..(4)

Substrate (3) from (4)

156y=117

Divide both sides by 156

y=117/156

y=0.75

Substitute the value of y in (3)

28x-16(0.75)=72

28x-12=72

Add 12 to both sides

28x=60

Divide both sides by 28

x=2.14

Therefore x=2.14,y=0.75

Answer:x=3

Step-by-step explanation:5(7x-4y=18)4x+20y=2735x-20y=904x+20y=27 just eliminate the -20 and +20 then get39x=11739x=117

then divide on both sides