SOLUTION: when doing systems of equations and graphing, i have a problem that reads 4x - 20 = 5y 8x - 10y = 12 i know how to graph the first equation but how do i graph the second

Algebra ->  Graphs -> SOLUTION: when doing systems of equations and graphing, i have a problem that reads 4x - 20 = 5y 8x - 10y = 12 i know how to graph the first equation but how do i graph the second       Log On


   

Question 241225: when doing systems of equations and graphing, i have a problem that reads
4x - 20 = 5y
8x - 10y = 12
i know how to graph the first equation but how do i graph the second equation? i was told by my instructor to solve using the intercept points by substuting the exponent with zero (4 * 0) - 20 = 5y and solve then sub zero for the other exponent and then graph the line but with the second equation the numbers come out in fraction form and i can not figure out how to graph the intercepts. any and all help would be appreciated...
thanks...
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
when doing systems of equations and graphing, i have a problem that reads
4x - 20 = 5y
8x - 10y = 12
--------------------------
Solve each for "y"
y = (-4/5)x - 4
Plot points: (0,-4)(5,0)
graph%28400%2C300%2C-10%2C10%2C-10%2C10%2C%28-4%2F5%29x-4%29
-----------------------------------------------
y = (4/5)x-(6/5)
Plot points: (-1,-2)(4,2)
graph%28400%2C300%2C-10%2C10%2C-10%2C10%2C%284%2F5%29x-%286%2F5%29%29
--------------------------
Both together:
graph%28400%2C300%2C-10%2C10%2C-10%2C10%2C%28-4%2F5%29x-4%2C%284%2F5%29x-%286%2F5%29%29
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Cheers,
Stan H.