Question

Equation X + 4 y is equal to 27 and X + y is equal to 21 by elimination method

Answer 1

x + 4y = 27----(1)

x + y = 21-----(2)

multiply equation (2) by 4

4(x + y= 21)--->4x +4y=84

x + 4y = 27

4x +4y = 84

(-). (-). (-)

_________

(-3x) = (-57)

x = -57/-3

x= 19

substitute x on equation (2)

19 + y = 21

y = 21- 19

y =2

Answer 2

X =19
Y = 2

Thanku.................................