Question

solve by cross multiplication method 4x + y = - 1 ; 7x +y = - 4 ​

Answer 1

Step-by-step explanation:

first you have put that RHS value in

LHS

ie

4x+y+1=0 7x+y+4

now we will apply 2312 rule

2 3 1 2

1 1 4 1

1 4 7 1

now we have to cross multiply

x/4-1 y/7-16 1/4-7

= ×/3 y/-9 1/-3

×/3=1/-3

we will cross multiply

x=3/-3

x=-1

similarly

y/-9=1/-3

y= -9/-3

y=-3

so you values are x= -1 and y=-3

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