3 years ago

I need help!!! I have no idea what the answer is Please help!

Mathematics

2 answers:

Aloiza [94]3 years ago

7 0

Answer:

k=3

Step-by-step explanation:

k-4/3=3

4-3=1

k/1=3

k=3

sorry if this does not make sense.

Archy [21]3 years ago

4 0

Answer:

Multiply both side by 3

$( \frac{k - 4}{3} = 3) \times 3 \\ k - 4 = 9 \\ \therefore \: k = 13$

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marta [7]

Answer:

Step-by-step explanation:

$\left\{\begin{array}{ccc}6x+3y=-21&\text{divide both sides by (-3)}\\2x+5y=5\end{array}\right\\\underline{+\left\{\begin{array}{ccc}-2x-y=7\\2x+5y=5\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad\qquad4y=12\qquad\text{divide both sides by 4}\\.\qquad\qquad y=3\\\\\text{Put it to the second equation:}\\2x+5(3)=5\\2x+15=5\qquad\text{subtract 15 from both sides}\\2x=-10\qquad\text{divide both sides by 2}\\x=-5$