Question

Two equations are given below:

a − 3b = 9
a = b − 3

What is the solution to the set of equations in the form (a, b)?

(−9, −6)
(−4, −3)
(−6, −3)
(−9, −7)

Answer 1

This tells you the a value so just use sustitution

Answer 2

\[( b-3)− 3b = 9\]

Answer 3

Solve

Answer 4

ok

Answer 5

but what does B equal ?

Answer 6

here you want to combine like terms to find the value of B

Answer 7

b = -9 ?

Answer 8

hmmm lets work out the steps...
\[(b−3)−3b=9 \]
now we want to combine like terms starting with b
\[-2b=12\]
then just divide by -2 and you get
b=-6
then just susbstitute that into equation 2
\[a = (-6) − 3\]

Answer 9

a = -9

Answer 10

yep :)

Answer 11

so the answer would be A ?

Answer 12

yep

Answer 13

thank you

Answer 14

welcome :)