Question

Solve the following pair of equations by elimination method and cross multiplication method:
2x + y = 8
x - y = 1

Answer 1

Answer:

x=3;y=2

Step-by-step explanation:

1) Elimination method:

2x+y=8

x-y=1

By solving ,we get

3x=9

x=3

substitute x=3 in " x-y=1 "

we get

y=2

2) cross multiplication method:

now,

the equations become

2x+y-8=0

x-y-1=0

x y 1

1 -8 2 1

-1 -1 1 -1

x/-1-8 = y/-8+2 = 1/-2-1

x/-9 = y/-6 = 1/-3

now,

x/-9= 1/-3

so,x=-9/-3=3

again,

y/-6=1/-3

so.y=-6/-3=2

hence, x=3 , y =2