5x+4y = 73
-4x + 4y = -8
5x + 4y -(-4x+4y) = 73 -(-8)
5x + 4y + 4x - 4y = 81
5x + 4x + 4y - 4y = 81
9x = 81
x = 81÷9
x = 9
Substitute x = 9 into any of the equations to find y.
5(9) + 4y = 73
45 + 4y = 73
4y = 73 - 45
4y = 28
y = 28÷4
y=7
Answers :
x = 9
y = 7
Assuming There is ONLY ONE CORRECT ANSWER,
The probability of her guessing the answer without ruling out the choices is 1/5.
if 3 choices are ruled out, then 1 out of the remaining two is right, which gives the probability 1/2
now, 1/5 = 20% , while 1/2 = 50%.
Therefore her probability of getting the correct answer improves by 30% [ not much in a REAL test though :P ]
- 18
2- 20
= -18
Because you do the same thing just going to end up with a negative.
Answer:
14C + 70B
Step-by-step explanation:
Let us represent:
The number of cans = C
The number of bottles = B
Her truck is filled with cans that weigh 14 ounces each and bottles that weigh 70 ounces each. There is a combined total of 880 cans and bottles in her truck.
The expression for the combined total weight (in ounces) of the cans and bottles in her truck is given as
Total weight in out = 14 × C + 70 × B
= 14C + 70B
When:
C + B = 880
Answer:
D
Step-by-step explanation:
I’m not sure but none of the others made sense