When solving emily wrote as her first step. which property justifies emily's first step?

addition property of equality.

Step-by-step explanation:

4(3 x^2 + 2) - 9 = 8 x^2 + 7

We can add 9 to each side, by using the addition property of equality.

a=b  then a+c = b+c

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).

-3.5 degrees per hour

step-by-step explanation:

find the unit rate:

-12   1/4 degrees           12.25 degrees

= - = -3.5 degrees per hour

      3   1/2 hours               3.5 hours