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Mathematics 66 Online
OpenStudy (anonymous):

Solving Systems of Equations Using Graphing

OpenStudy (anonymous):

Your favorite clothing store has jeans on sale for one price and tee shirts on sale for another price. You purchase two pairs of jeans and four tee shirts for $90. Your friend, Sam purchases 3 pairs of jeans and 2 tee shirts for $95. Write a linear equation for your purchases and an equation for Sam's purchases. Let x represent the cost of one pair of jeans and y represent the cost of one tee shirt. Graph each of these equations on the same coordinate plane (using graph paper). Label the axis with jeans on the horizontal axis (x) and tee shirts on the vertical axis (y). What is the meaning of this point of intersection in this problem? Use words and numbers in your explanation. How much does a pair of jeans cost? How much does one tee shirt cost?

OpenStudy (anonymous):

i really just need to learn how not this specific problem

OpenStudy (anonymous):

A telephone company offers customers two payment plans for monthly service. Plan A costs $5 per month plus $0.10 per minute for calls. Plan B cost $8 per month plus $0.07 minute for calls. 1. Write an equation for each plan. Are these equations in standard form or Slope-intercept form? You will use the above graph to answer matching questions in Exercise #2.

OpenStudy (anonymous):

^^^^ that one is probably better

OpenStudy (tkhunny):

Well, you should create equations and make the graphs. J = # of Jeans Purchased S = # of T-Shirts Purchased

OpenStudy (anonymous):

i dont know how to write the equations tho i got 2x+4y=90 and 3x+2y=95

OpenStudy (anonymous):

which is right im sure but the second one is from the actual lesson worksheet and i dont know the equation because it wont graph without the total value

OpenStudy (tkhunny):

Well, you have not defined those variables, but otherwise, it appears that you DO know hiw to write equations, Now, graph them.

OpenStudy (anonymous):

|dw:1431526191760:dw|

OpenStudy (anonymous):

it looks something like that for the first one

OpenStudy (anonymous):

they intersect at (25,10)

OpenStudy (tkhunny):

That's about right. Good work.

OpenStudy (tkhunny):

Do those values work in both equations?

OpenStudy (anonymous):

idk ...

OpenStudy (anonymous):

i really just need help with the second problem on there because i cant get the equation because in standard form i dont think it works im thinking it has to be in slope form ...y=mx+b

OpenStudy (tkhunny):

How can you not know? 2x+4y=90 and 3x+2y=95 x = 25 y = 10 Try them out!

OpenStudy (tkhunny):

"FORM" is not significant. Just graph them. If Slope-Intercept is your favorite, use that.

OpenStudy (anonymous):

yea im not sure wat you mean by that first part i inserted them in the equation and it was funny

OpenStudy (anonymous):

ok how do i do that second part i dont know how to put them in slope intercept

OpenStudy (tkhunny):

?? Yes you do. 2x+4y=90 Divide by 2 x+2y=45 Subtract x 2y = -x + 45 Divide by 2 y = -½x + 22½ There. Slope-Intercept Form. You do the other one.

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