Question

Solve the method of elemination:
x + 2y = 20
4x + y = 19​

Answer 1

Answer:

Consider the equations:

2x+y=23.........(1)

4x−y=19.........(2)

Add equations 1 and 2 to eliminate y, because the coefficients of y are the opposite. So, we get

(2x+4x)+(y−y)=23+19

i.e. 6x=42

i.e. x=7

Substituting this value of x in (1), we get

14+y=23

i.e. y=23−14=9

i.e. y=9

Therefore, the solution of the equations is x=7,y=9.

Hence, x−3y=7−27=−20 and 5y−2x=45−14=31.

Answer 2

Answer:

a¹/a²≠b¹/b²

Step-by-step explanation:

x+2y=20

4x+y=19

x+2y-20=0

4x+2y-19=0

a¹x+b¹y-c¹=0

a²x+b²y-c²=0

here,a¹=1,b¹=2,c¹=-20

a²=4,b²=2,c²=-19

a¹/a²=1/4

b¹/b²=2/2

c¹/c²=-20/-19

=a¹/a²≠b¹/b²