Hello,
One solution is y=x/9
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It would be true because 10,000-99,999=-89999 -89999<0 is true
All you do is solve for z. So 8z-13=7. To solve for a variable you have to do the opposite to cancel out the numbers on each side. First you add 13 over to 7 to cancel out 13 on the z side. So 8z=20 is what you have left. Then you divide 8 on both sides to cancel out 8 on the z side. what you are left with is z=2.5. Lastly you plug and check. 8(2.5) - 13 = 7, 20-13=7. And thats correct so z is 2.5.
Answer:
Step-by-step explanation:
2 csc²x-2 csc x-1=0
or

Times it bye 4 thin subtract bye 6