Question

Which ordered pairs are on the line ​ 3x−4y=9 ​?

Select each correct answer.

Answer 1

`\displaystyle\\a)~~~3\cdot\left((2)/(3)\right)-4\cdot\left(-(7)/(4)\right)=(3\cdot2)/(3)+(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(-(3)/(2)\right)=3+(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)}`