SOLUTION: this is from (barron's)algebra book...the level of national income (y) in a country can be found from the two-equation system...Y=C+I+G

Question 300927: this is from (barron's)algebra book...the level of national income (y) in a country can be found from the two-equation system...Y=C+I+G
C=a+bY solve for Y and C assuming that I(investment spending),G (government spending),a, and b are known.
i have no clue how to do this one.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

Let's substitute to simplify the knowns.

So then,
1.
2.
You're solving for C and Y.
You can do a direct substitution using eq. 1 in eq. 2 and solving for C.

Then go back and solve for Y using eq. 1,

Now we can go back and re-substitute,

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