rearrange into the form y = mx + b
subtract 6x from both sides of the equation
7y = - 6x + 14
divide all terms by 7
y = -
x + 2 → in slope- intercept form
The change in temperature for 1 hour would be -5. hope this helps.
X³ + 343 =
x³ + 7³ =
(x+7)(x²-7x+49)
You could use divisibility rules.