Level Up Your Linear equations and graphs Skills with Practice Problems and Expert Insights

State which of the following are linear functions.
a. $f(x)=3$
b. $g(x)=5-2x$
c. ${\displaystyle h\left(x\right)=\frac{2}{x}+3}$
d. $t(x)=5(x-2)$

Given linear equation y = 3+4x 
1. calculate the slope and y-intercept.
2. determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation. 
3. use two points to graph the equation.

Each of the following graphs shows two ordered pairs (x,y). Find $△x$ and $△y$ from the point on the left ti the point on the right. 

Find the equation in standart form of the line with slope $\frac{5}{4}$ and y-intercept equal to -2

Determine the value of k for which the point (- 2, 3) lies on the line whose equation is .

$4x+3ky=10$

What would be the linear equation for this function, and the graph?
${\displaystyle (X_1,Y_1)=(4,8),(X_2,Y_2)=(6,-9)}$

Identify the lines that are parallel.
Line 1: $y=-5$
Line 2: $4y-16x=-1$
Line 3: $x=-6$
Line 4: $y+5=4(x+1)$