STAAR Algebra I Linear Functions, Equations, and Inequalities. Practice it free.

What is the $y$-intercept of the line $y = \dfrac{3}{4}x - 7$?

Suppose $z(x) = -2x + b$, where $b$ is a constant. If $z(8) = 3$, what is the value of $z(1)\textsf{?}$

A tutor charges $\text{\char36}35$ per session and no registration fee. Let $x$ be the number of sessions and $y$ be the total cost in dollars. Which equation models the situation?

What is the slope of the line through $(3, -2)$ and $(5, 8)$?

An online course begins with $5{,}000$ students enrolled. Each week, a model estimates that $10\%$ of the students still enrolled withdraw. Which equation defines this model, where $e(w)$ is the estimated number of students still enrolled $w$ weeks after the course begins?

The function $R$ is defined by $R(t) = 900(0.5)^{t/12}$. The function $R$ models the intensity of background radiation, in millisieverts, measured $t$ months after a person enters an underground shelter. Which statement best describes what the $12$ in the expression $t/12$ represents?

A substance has a half-life of $2$ years. What fraction remains after $6$ years?

The function $v$ is defined by $v(y) = 18{,}000(0.88)^{y}$. The function models the value, in dollars, of a used scooter $y$ years after it is purchased. Which statement is the best interpretation of $18{,}000$ in this context?