HELP NEEDED PLEASE !! WILL GIVE BRAINIEST
2 answers:
The answers is C Bc it is
Answer:
C
Step-by-step explanation:
x + 2y = 21
4x + y = 21
Multiply the second equation by -2 to get:
-8x - 2y= -42 {Add this to the original equation; y's will be eliminated}
+ x + 2y = 21
-7x = -21
x = 3
see if y = 9 works . . .
3 + 2(9) = 21 and it does
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