Writing equations in

slope intercept formY = mX + b

Slopeor

Rate of change

Y intercept

X

Y

4

5

The line has a negative trendSo the slope is - ⅘

The y intercept is at 0, -3

So the equation for the line is……

Y = -⅘X - 3

X

Y

4

12The line has a positive trend So the slope is ⁴⁄₁₂ = ⅓ The y intercept is at 0, 6So the equation for the line is……

Y = ⅓X + 6

X

Y

2

1

The line has a positive trend So the slope is ²⁄₁ = 2

The y intercept is at 0, 1

So the equation for the line is……

Y = 2X + 1

X

Y

2

3The line has a negative trendSo the slope is - ⅔

The y intercept is at 0, -1

So the equation for the line is……

Y = -⅔X - 1

X

YY = ½X + 6

Y = ½X + 0

Y = ½X - 4

Parallel lines will ALWAYSHave the same slope

X

Y

Horizontal line Y = 2

X

Y

Vertical lineX = - 5