1. A. x parrot fish + y triggerfish = 320 total fish. y = 7x shows that there are 7 times as many triggerfish. 2. C x + y shows a total score of 425. y = 2x - 70 shows that Michael's score, y, is 70 less (minus) than twice Kathryn's 3. write two equations x + y = 27 total feet 2x + 3 = y Substitute 2x + 3 for y in the first equation x + (2x + 3) = 27 3x + 3 = 27 3x = 24 x = 8 Substitute 8 in to either equation to find the other length. 8 + y = 27 y = 19 The shorter piece is 8 and the longer piece is 19 4. x + y = 3200 people -> y = 3200-x 8x + 12y = 33,040 dollars 8x + 12(3200 - x) = 33040 8x + 38400 - 12x = 33040 -4x = -5360 x = 1340 (1340 children) 1340 + y = 3200 y = 1860 adults 5. I don't think the numbers for this were put in correctly because I get a decimal and a negative number when I solve for it but hopefully if you do get the correct cost/amount of coins you will understand this well enough to do it on your own. Hope I helped!
it can be. It just depends on what you are interested in. If you are interested in a scientific field then it is an amazing way to use your time. But if you are bot interested in science, it is a waste personally.
