Algebra 1 Air Test Formula

slope formula

m = (y2 - y1) / (x2-x1)

slope - intercept form

y= mx+ b

point slope form

y-y1=m(x-x1)

Linear standard form

Ax+By=c

Quadratic standard form

y=ax2+bx+c

vertex form

y=a(x−h)2+k

Quadratic in intercept form

y=a(x-p)(x-q)

axis of symmetry

x= -b/2a

Quadratic formula

x= -B ± √(B²-4AC) / 2A

exponential form

y = a(b)^x

Exponential growth

y = a(1+r)^x

Exponential Decay

y = a(1-r)^x

Arithmetic Explict

An=a1+d(n-1)

Geometric Explicit

An=a1*r n-1

arithmetic Recursive

An=# An=an-1 +d

Geometric Recursive

A1=# An=an-1 * r