$\"\"$ $\"\"$

The line equation in slope-intercept form is $\"\"$ , where m is the slope

and b is the y-intercept.

$\"\"$ (Original Equation) $\"\"$

According to addition property of equality: Add 9 to each side.

$\"\"$

$\"\"$ (Apply additive inverse property: $\"\"$ )

$\"\"$ (Additive identity property: $\"\"$ )

$\"\"$ (Add: $\"\"$ ) $\"\"$

The line equation in Slope-intercept form is $\"\"$ .