ACT Math 1.5 Elementary Algebra
Math Elementary Algebra: Drill 1, Problem 5. Solve for a using substitution.
|ACT Math||Elementary Algebra|
|ACT Mathematics||Elementary Algebra|
|Elementary Algebra||Evaluation of algebraic expressions through substitution|
|Foreign Language||Arabic Subtitled|
|One-Variable Equations and Inequalities||Solving Equations|
|Product Type||ACT Math|
It's another one of those problems that wants us to put our super-duper substitution skills
We want to get either a or b alone. Like what is a simply or what is b simply
In the first equation, b's already by itself...
...so we can just add 8 to both sides to get b = 4a + 8.
Plugging that into the other equation in place of b, we get a + 4a + 8 = 18...
...and when we slap our a terms together and subtract 8 from each side...
...we're left with 5a = 10. Divide both sides by 5, and a = 2.
Our answer is B.
As in, "Binomial Man."