7x-4y=18

4x+20y=27 solve e by elimination method

x=3

Step-by-step explanation:

5 (7x-4y=18)

4x+20y=27

35x-20y=90

4x+20y=27 just eliminate the - 20 and + 20 then get

39x=117

39x=117

then divide on both sides

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