Mrs. Solar is remodeling a house and is looking for a contractor to do the work. She is getting quotes from 3 different contractors, and will hire one of them based on the total cost. Each company uses a formula to calculate its fees based on the number of hours the work will take. Mrs. Solar modeled Contractor 1’s fee formula with the equation y = 50x + 200. (a) Graph the equation y = 50x + 200. Give each axis a label. (b)Describe what the equation y = 50x + 200 means in the real-world context. (c)Give 3 ordered pairs that are true to the equation and explain what each ordered pair me
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your equation is y=50x+200 ---> y=mx+b. where m is the slope and b the y-intercept.
Your are going to start your graph is (0, 200)
then (2,300) right?
start your graph at*
No, you are going to do rise/run.
it's acutally (1,300)
go up "50" and run "1"
ok one second please
oh, wait. got mixed up. from 200, go up "50" and run "1"
ok
how do i draw on the graph picture?
so i put a mark on (1,250) ???
yes. you can see the points in the graph i posted.
ok so that is what i draw?
yes
ok gimme a sec please!
do i stop writing the (2,250), (2,300)..... i stop writing those at (4,400)
?? or do i keep writing them or does it not matter?
you can draw a line like this |dw:1428979177452:dw|but the line has to go through points (1, 250) (2, 300) (3, 250) (4, 400) (5, 450) and (6, 500) (7, 550)
(1, 250) (2, 300) (3, 350)* (4, 400) (5, 450) and (6, 500) (7, 550)
so the line basically goes through (0,200) to (7,550) with the dots in between?
lol im a little slow :P
yes. but remember that you have to go up "50" and run "1"
so that's part a.
ahh okay! whats next?
let's move to b. The equations is y=50x+200. 200 is a flat rate here.
it means there is $200 for the work and an additional $50 for every extra hour?
It's like someone telling you that the person can do a job for you, but you have to pay them some money first. In this case, it will be, say, $200.
yes
correct.
yippy! okay next?
ok. for c, we will choose 3 points from the graph. which ones do you want to use?
(0,200) (1,250) and (2,300)
OK. For (0, 200) is your starting point, right? In this point, it means you have only paid the flat rate.
ok so i only paid for the job to be done so yes!
then go to to point (1, 250). Remember the equation y=50x+200. x=hours=1, right?
You have paid for the flat rate (200) and they have worked for an hour, which costs you each $50. In total, you have paid 250 for the work.
yes
|dw:1428980394452:dw|
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