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OpenStudy (anonymous):
Solve this system of equations: 2x - y = 7 5x + y = 21 A. (4,1) B. (5,3) C. (3,6) D. (2,-3)
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hartnn (hartnn):
Add those 2 equations, what do u get ?
OpenStudy (anonymous):
x=3.5 + 0.5y x = 4.2 + -0.2y @hartnn
hartnn (hartnn):
is that a new question ?
OpenStudy (anonymous):
no thats what i got
OpenStudy (anonymous):
i think the answer is A
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hartnn (hartnn):
2x - y = 7 5x + y = 21 adding them 2x-y + 5x +y = 7+21 notice that y cancels out. can you find x now ?
OpenStudy (anonymous):
x=4 @hartnn
hartnn (hartnn):
yes!
hartnn (hartnn):
2(4) - y = 7 find y :)
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