(1) 4x-12 = 34
Graph line use intercepts if only 1 intercept exists use it and another point to draw the line.
(2) -25X + Y = 55
What is the Y intercept
What is the X intercept
$\displaystyle 4x-12 = 34$
$\displaystyle 4x = 46$
$\displaystyle x = \frac{46}{4}$
y-intercept make x = 0
$\displaystyle -25X + Y = 55$
$\displaystyle -25\times 0 + Y = 55$
Now solve for y
x-intercept make y = 0
$\displaystyle -25X + Y = 55$
$\displaystyle -25X + 0 = 55$
Now solve for x
(1) Solving for x will give you your x-intercept. Since there is no y, it's obvious that this is a vertical (|) line running parallel to the x-axis.
(2)To find the x-intercept set y=0 and solve for x.
So,
$\displaystyle -25x+(0)=55$ Solve for x
To find the y-intercepts set x=0 and solve for y.
So,
$\displaystyle -25(0)+y=55$ Solve for y.
Hope that helps