Answer:
y - 7 = 
(x + 8)
Step-by-step explanation:
Use the slope formula 
to work out the slope
Then pick one point to insert into the formula y - y1 = m(x - x1)
Answer:
The initial cost of the cell phone was $364
Step-by-step explanation:
Since there was a 30% markup, 70% of the new cost is the initial cost. Multiply 520 by 0.7 on a calculator and you get 364
Answer:
Step-by-step explanation:
Maximum weight with no extra fee = 50 pounds
Current weight = 30.5 pounds
<u>Required inequality:</u>
<u>Solve it:</u>
Clara can pack extra 19.5 pounds without extra fee
Answer: 39 pounds of type A coffee were used.
Step-by-step explanation:
Let x represent the number of pounds of type A coffee that were used in the blend.
Let y represent the number of pounds of type B coffee that were used in the blend.
Type A coffee costs Lena $5.70 per pound, and type B coffee costs $4.25 per pound. The total cost of the mixture is $885.30. It means that
5.7x + 4.25y = 885.3- - - - - - - - - -1
This month's blend used four times as many pounds of type B coffee as type A. It means that
y = 4x
Substituting y = 4x into equation 1, it becomes
5.7x + 4.25 × 4x = 885.3
5.7x + 17x = 885.3
22.7x = 885.3
x = 885.3/22.7
x = 39
y = 4x = 4 × 39
y = 156
