Algebra Lesson R.8: Evaluating Algebraic Expressions

Practice Exercises:

Evaluate the following expressions in one variable at the given value

1. $2x+5$ at $x=3$

2. $3y^2-2y+3$ at $y=1$

3. $\frac{2}{3}t + \frac{1}{3}$ at $t = \frac{7}{3}$

Evaluate the following expressions in two variables at the given values

4. $(2-x)(4-y)$ when $x=4$ and $y=2$

5. $(\frac{1}{2}x)(2y)$ when $x =\frac{4}{3}$ and $y = 8$

6. $.7x + .3y$ when $x=1$ and $y=1$