Writing Exponential Function Equations from Tables

y = a / b^x

y = a - bx

y = a * b^x

y = a + bx

The factor

The slope

The y-intercept

The x-intercept

y = 2 * 3^x

y = 3 + 2x

y = 3 * 2^x

y = 2 + 3x

Subtract the lower value from the upper value

Divide the lower value by the upper value

Divide the upper value by the lower value

Multiply the lower value by the upper value

y = 2 * 10^x

y = 2 + 10x

y = 10 * 2^x

y = 10 + 2x

The y-intercept is negative

The factor is greater than one

The factor is between zero and one

The x-values are negative

y = 72 - 3x

y = 72 * 3^x

y = 72 * (1/3)^x

y = 72 + 3x

y = 0.1 + 2x

y = 0.1 * (1/2)^x

y = 0.1 - 2x

y = 0.1 * 2^x

Subtract the lower value from the upper value

Divide the lower value by the upper value

Divide the upper value by the lower value

Multiply the lower value by the upper value

2

1/2

0.1

0.5