SOLUTION: Okay how do I solve the following questions by following this rule: "Graph the following equations; calculate the slope, x-intercept, and y-intercept, and label the intercepts on t

Question 308009: Okay how do I solve the following questions by following this rule: "Graph the following equations; calculate the slope, x-intercept, and y-intercept, and label the intercepts on the graph."
4. y = -2x - 7
5. 2x + 3y = 9

6.
A consumer electronics company sells 6.7 million MP3 players per month at a price of $100 apiece; when the price is lowered to $80, the company sells 10.2 million players per month. How many MP3 players can the company expect to sell per month at a price of $75?
7.
The points (1,5), (4,5), and (1,0) represent three corners of a rectangle; find the coordinates of the fourth point.
8.
Seven inches are equivalent to 17.78 cm. Find the equation converting length in cm to length in inches. What is the length in inches of a 96.2 cm bar?
9.
Find an equation in slope-intercept form passing through the points (2,5) and (7,-3).
10.
Sales tax in Pennsylvania is 6%. Create an equation for the total price (cost plus tax) of a purchase in PA in terms of its cost. How much would a person pay for a car whose cost is $32,000?
Many many thanks for those who can help with these questions.
Answer by FeliciaGail(1) (Show Source): You can put this solution on YOUR website!
5. ) 2x + 3y = 9
Y=mx + b
3.8y=-4.2x +1.9
Y= (-4.2/3.8)x +1.9/3.8
Y= (-2.1/1.9) x +.5
Y=y=1.1x +.5
Now you have the slope of this line (-1.1) and the y-intercept of .5 setting y=0 you can get the x-intercept thus.
0 = 1.1x + .5
1.1x =.5
X =.5/1.1
X = .4545 which is the x �intercept (.4545, -1.1) are two points on the line.

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