The temperature at 7 a. m. was -11°C. The temperature increased by 9°C during the day and then decreased by 4°C at 8 p. m. Which was the temperature at 8 p. m.?

-6

Step-by-step explanation:

I got -6, because -11 + 9 is -2 and -2 - 4 is -6. Hope this helped! If you are still confused, please comment so I can help you!

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b