Answer:
3. D) 
2. D) 
1. B) 
Step-by-step explanation:
3.
{y = 3x + 7
{y = x - 9
x - 9 = 3x + 7
-3x - 3x
____________
−2x - 9 = 7
+ 9 + 9
__________
−2x = 16
____ __
−2 −2
[Plug this back into both equations above to get the y-coordinate of −17]; 
__________________________________________________________
2.
{−4x + 3y = 12
{−2x + 3y = −18
−½[−4x + 3y = 12]
{2x - 1½y = −6 >> New Equation
{−2x + 3y = −18
_______________
1½y = −24
____ ____
1½ 1½
[Plug this back into both equations above to get the x-coordinate of −15]; 
__________________________________________________________
1.
{−10x - 3y = −18
{−7x - 8y = 11
−⅜[−7x - 8y = 11]
{−10x - 3y = −18
{2⅝x + 3y = −4⅛ >> New Equation
_________________
−7⅜x = −22⅛
______ _____
−7⅜ −7⅜
[Plug this back into both equations above to get the y-coordinate of −4]; 
I am joyous to assist you anytime.
Answer: It would cost $56
Step-by-step explanation:
2 adults = 20 + 20 = 40
20 * 0.40 = 8
2 children = 8 + 8 = 16
16 + 40 = 56
You need to make a proportion
beats 28 x
seconds 4 30
cross multiply and divide
(28) (30) = 4x
840 = 4x
210 = x
The answer would be 32
Explanation:
Replace the z with 2 and you would have to multiply it by 4 and it equals 8
Then replace the y with three and when you add it to 1 it gets 4
Then once you get 8(4) you multiply it making it 32. Hope this helped!
