Answer:
C. (7, –3)
Step-by-step explanation:
5x+6y=17
-10x-9y=-43
Multiply the first equation by 2
2(5x+6y)=17*2
10x +12y = 34
Add this equation to the second equation to eliminate x
-10x-9y=-43
10x +12y = 34
---------------------
3y = -9
Divide by 3
3y/3 = -9/3
y = -3
Now we need to find x
5x+6y = 17
5x +6(-3) = 17
5x-18 = 17
Add 18 to each side
5x-18+18 =17+18
5x =35
Divide by 5
5x/5 = 35/5
x =7
(7,-3)
You can use logic to say right off the bat that you have 2 one dollar bills
if you said you had 7 instead there would be not enough bills to add up to 82
so that means 4 $5 and 6 $10
check you have 12 bills and it adds up to $82
2 $1
4 $5
6 $10
X^2=-5x+8
x^2+5x-8=0
put in quadratic formula(in image)
Answer is A.
(I need all the points I can get lol)
If you need help, feel free to message me.
Step-by-step explanation:
angles a,f,g form a triangle
sum of angles in ∆ = 33 + 112+ a = 180
145 + a = 180
a = 35°
