Question

X + y is equal 4
5x + 4y is equal 18
by elimination method
​

Answer 1

Step-by-step explanation:

x+ y= 4

x= 4y

5x+4y= 18

put value of x

5(4y) + 4y = 18

20y+ 4y= 18

24y= 18

y= 18/24

y= 3/4

so,x= 4y

x= 4(3/4)

x= 3

Answer 2

Step-by-step explanation:

multiply 5 by equ 1

5(x+y = 4)

5x + 5y = 20

it is equ 3

subtract equ 2 from equ 3

5x + 5y. = 20

5x + 4y. = 18

change the signs

0 - y = 2

y. = 2 - 0 = 0

y = 0

put y = 0 in equ 2

5x + 4(0) = 18

5x +4 = 18

5x = 18 - 4

5x = 14

x = 14 divide by 5