Question

how do you find thw value for 3a+b in substitution

Answer 1

Step-by-step explanation:

a+b=3 ------- (1)

−3a+2b=1 ------ (2)

From equation 1:

a=3−b

Substitute the value of a in equation 2 :

−3a+2b=1

−3(3−b)+2b=1

−9+3b+2b=1

5b=10

b=

5

10

=2

Now, Substitute b=2 in equation 1:

a+b=3

a+2=3

a=3−2

a=1

Therefore the solution is: a=1 and b=2