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Mathematics 7 Online

OpenStudy (xxlyh):

Help please!! will medal! A student is trying to solve the set of two equations given below: Equation A: x + z = 6 Equation B: 5x + 7z = 1 Which of these is a possible step used in eliminating the z-term? Multiply equation A by 5. Multiply equation B by 5. Multiply equation A by -7. Multiply equation B by 7.

10 years ago

OpenStudy (aveline):

Any ideas?

10 years ago

OpenStudy (xxlyh):

no :(

10 years ago

OpenStudy (aveline):

What happens if we multiply the first equation by -7?

10 years ago

OpenStudy (aveline):

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10 years ago

OpenStudy (xxlyh):

ohhhh so it would be C?

10 years ago

OpenStudy (aveline):

Right. By multiplying equation A by -7, we can cancel out the z's. This way we can find the x value!

10 years ago

OpenStudy (xxlyh):

I understand now :D thank you for your help!!

10 years ago

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