Question

solve the linear equation:(by elimination method).
9m + n = 21 and 4m + 9n = -42
​

Answer 1

Answer:

m=3,n= -6

Step-by-step explanation:

Hope it helps.If so please mark as brainliest.

Answer 2

Answer:

m=3, n= -6

Step-by-step explanation:

(9m+n=21)×9-----(1)

4m+9n=-42

81m+9n=189

4m+9n=-42

-___-__+__

77m=231

m=3

9m+n=21===》9×3+n=21

n=21-27

n=-6