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February 28, 2015

February 28, 2015

Posted by **Maria** on Wednesday, March 14, 2012 at 2:11pm.

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1.A ticket service is selling tickets to a concert. An order of 4 tickets has a price of $63 and an order of 6 tickets has a price of $91. Write an equation to find the price of any amount of tickets.

A.y = 9x

B.y = 32x

C.y = 14x + 7

2.A rental car company charges $75 for a 3-day rental and $155 for a 7-day rental. Write an equation to find the amount that the rental car company will charge for any number of days.

A.y = 20x + 15

B.y = 15x - 20

C.y = 25x

3.Write the point-slope form of an equation of the line that passes through (-2, 3) and has a slope of m = -3.

A.(y - 2) = -3(x + 3)

B.(y - 3) = -3(x + 2)

C.(y + 3) = -2(x + 2)

4.Write the slope-intercept form of an equation of the line that passes through

(3, 5) and has a slope of 6

A. y = 2x - 6

B.y = 6x - 13

C.(y - 5) = 6(x - 3)

5. State the domain of the function y=3/x

A. D: x ≠ 0

B.D: x <0

C.D: all real numbers

- Algebra 1 -
**Steve**, Wednesday, March 14, 2012 at 2:52pm1.

Since adding 2 tickets increases the cost by $28, tickets must cost $14 each. The only logical choice is thus (C).

Check: 14*4+7 = 56+7=63 and 14*6+7=84+7=91

2.

This is exactly the same problem, just different numbers. Increasing the days by 4 raises the cost by $80,meaning $20/day. Choice (A)

3.

The slope between two points is m=∆y/∆x where ∆ means "change in"

So, the slope between (x,y) and any point on the line is the same value: -3.

In particular, the slop between (x,y) and (-2,3) is -3. Symbolically, that is

(y-3)/(x+2) = -3

or, (y-3) = -3(x+2)

Choice (C)

4.

This one starts the same way, getting you to:

(y-5)=6(x-3)

However, they asked for the slope-intercept form, y=mx+b. So, solve for y:

y-5=6x-18

y=6x-13

Choice (B)

5.

Division by 0 is not defined, so 3/x is not defined when x=0.

So, choice (A)

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