Answer:HOLA I Do not speack spanish
Step-by-step explanation:
Answer:
Step-by-step explanation:
y = -5x - 17
in y = mx + b form, the y int is in the m position
y = mx + b
y = -5x - 17......so the y int (b) = -17 or (0,-17) <=== y intercept
u can also find the y intercept by subbing in 0 for x and solving for y
u can find the x intercept by subbing in 0 for y and solving for x
y = -5x - 17
0 = -5x - 17
5x = -17
x = -17/5......so the x intercept is -17/5 or (0,-17/5) <==== x intercept
Count change of signs to tell positive roots
then replace x with -x and evaluate, then count change in sign for negative roots
initially
+, -, -, +, +, -
3 changes
3 or 1 positive roots
replacing x with -x
-,-,+,+,-,-
2 changes
2 or 0 negative roots
B is answer
Answer:
B. 88.8
Step-by-step explanation:
let x represent class y
(x+71.2)/2=80 multiply each side by 2
x+71.2=160 subtract 71.2 by both sides
x=88.8
or
trial an error
replace x with each of the numbers and see if it plugs in.
example:
(80.5+71.2)/2=80
151.7/2=80
75.85=80?
false. incorrect
another example:
(88.8+71.2)/2=80
160/2=80
80=80?
true. correct
the numbers inside the () are first number is x second number is y so it is (x,y)
so for y<x the second number needs to be smaller than the first number
so right away (3,3) is not the answer
and then y also has to be greater then 2x-3
so replace x with the fist numbers and see what you get.
(2x2)-3 = 4-3 = -1 since -1 is not greater than -1 the second answer (2,-1) is not right
3rd one (-1,-2) 2(-1)-3 = -2-3=-5
so -2 is greater than -5 and -2 is less than -1 so the 3rd one is the answer
