Chapter P-4 is based on
linear equations. Linear equations are
algebraic equations of the form
y = mx + b, where x and y are
variables, m is the
slope of the equation, and b is the
constant. Linear equations
intersect the y-axis at the y-intercept while the x-axis at the
x-intercept. Linear equations only have one x-intercept. If we were to find an equation from a slope and two points, we use the
point-slope formula,
(y -y1) = m(x - x1). Then the equation will always come out to be in the form of y = mx + b.
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