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Mathematics 7 Online
OpenStudy (anonymous):

help me please

OpenStudy (anonymous):

Solve the system by the addition method. x2 - 3y2 = 1 3x2 + 3y2 = 15 A. {( 1, 2), ( -1, 2), ( 1, -2), ( -1, -2)} B. {( 1, 2), ( -1, -2)} C. {( 2, 1), ( -2, 1), ( 2, -1), ( -2, -1)} D. {( 2, 1), ( -2, -1)}

OpenStudy (anonymous):

@isaac4321

OpenStudy (anonymous):

._.

OpenStudy (joannablackwelder):

Any thoughts on how to start?

OpenStudy (anonymous):

substitute the x and the y maybe

OpenStudy (joannablackwelder):

Can you show me what you mean?

OpenStudy (anonymous):

1+2 - 3+2 -1= 1

OpenStudy (joannablackwelder):

Hm, how did you get that?

OpenStudy (anonymous):

x2 - 3y2 = 1 substituted in this equation

OpenStudy (joannablackwelder):

Hm, I'm not sure what you mean, but the question states to solve by the addition method. Not substitution.

OpenStudy (joannablackwelder):

The addition method works by adding the equations together in a way that cancels out one of the variables.

OpenStudy (anonymous):

ok so how do i do that

OpenStudy (joannablackwelder):

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