Answer:
42
Step-by-step explanation:
6*(-3) = (-18)
24-(-18) = 42
It will take 148
hours (In decimal form its 148.66336633)
500500-200200=300300
300300÷2020=148.66336633
For 1 multiply both sides by 3 which gives you 3y-y=12. Then combine like terms 2y=12. Lastly divide both sides by 2 and you get y=6. And for 3 first multiply both sides by 4 which gives you 6y-32=y+8. After that combine like terms 6y-y-32=8. Now add the equation together 5y=40 and then divide by 5 and get y=8
There are two solutions.
.. (3, 2)
.. (0.2, -3.6)
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If you're choosing possibilities from a list, trying them in the equations usually gives quick results.