C. 4x + y = 21
4(3) + 9 = 21
12 + 9 = 21
21 = 21
Answer:
c
Step-by-step explanation:
you have to turn the48 to a decimal
quadratic equations can be soled by 3 methods
factorization
completing square
quadratic formula
but factorization is the simplest
First you cross multiply.
2*(b-4)=6b
Then distribute the 2.
2b-8=6b
Minus 2b from each side.
-8=4b
Divide each side by 4.
-2=b
So -2 is your answer.
C. a-3x=0
Equations are like a balance scale. There needs to be an “=“
