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OpenStudy (anonymous):
2.) If 2x + 5y = 21 and x + y = 3, then what is the value of x? It is your choice to use either substitution or elimination, but you must show your work..... Can someone please help me with this!
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OpenStudy (the_fizicx99):
I'd use sub since you can just put it in y = mx +b x + y = 3 y = -x + 3 2x + 5(-x + 3)= 21 2x -5x + 15 = 21 -3x + 15 = 21 -3x = 6 x = -2
OpenStudy (the_fizicx99):
Plug that into one of the equations, and solve for y
OpenStudy (anonymous):
Thank you so much!
OpenStudy (the_fizicx99):
You're welcome
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