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Sidana [21]
3 years ago
7

Which ordered pairs are on the line ​ 3x−4y=9 ​? Select each correct answer.

Mathematics
1 answer:
Sergeu [11.5K]3 years ago
6 0

 

\displaystyle\\a)~~~3\cdot\left(\frac{2}{3}\right)-4\cdot\left(-\frac{7}{4}\right)=\frac{3\cdot2}{3}+\frac{4\cdot7}{4}=2+7=9~~~\text{(Correct)}\\\\\\b)~~~3\cdot\left(-5\right)-4\cdot\left(-6\right)=-15+24=9~~~\text{(Correct)}\\\\\\c)~~~3\cdot\left(1\right)-4\cdot\left(-\frac{3}{2}\right)=3+\frac{4\cdot3}{2}=3+2\cdot3=3+6=9~~~\text{(Correct)}\\\\\\d)~~~3\cdot\left(-1\right)-4\cdot\left(3\right)=3-12=-9~~~\text{(Wrong)}



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The known facts

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Now, let's set up the equations where N is Natalie's age and F is Fred's age.

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