1.8 Solving systems of linear equations and polynomial equations with technology Quiz

1. Solve $x+y=7$ and $2x-y=5$.

• A. $x=3$, $y=4$
• B. $x=5$, $y=2$
• C. $x=4$, $y=3$
• D. $x=2$, $y=5$

2. What does it mean for $x=3$ to be a root of $f(x)=0$?

• A. $f(3)=0$
• B. $f(0)=3$
• C. $f(x)=0$ for all $x$
• D. $f(x)=3$ when $x=0$

3. How many equations are needed to find three unknowns uniquely?

• A. 1
• B. 2
• C. 4
• D. 3

4. Use your GDC to solve $x^{2}-4x-1=0$.

• A. $x=4.24$ and $x=0.236$
• B. $x=4.24$ and $x=-0.236$
• C. $x=-4.24$ and $x=0.236$
• D. $x=2$ and $x=-1$

5. A projectile model gives $t=-0.5$ and $t=4$ seconds when $h=0$. Which is the time it lands?

• A. $t=-0.5$ s
• B. Both
• C. $t=4$ s
• D. Neither