There two forms to write an equation in; slope-intercept form,
y =
mx +
b, where
m is the slope and
b is the
y-intercept; and point-slope form, which is given by

, where
m is the slope and (
x₁,
y₁) is a point on the line. Given the information and instructions you have I assume you need point-slope form. For #1, you have
m = 2 and point (3, 5). Substitute these values in:

If you need slope-intercept form, you start by using the distributive property on what you just wrote:

Now cancel the 5 to isolate
y:
