Equation #1 - move 3b to the right side. Now you're left with a=3b + 4 plug in that for a in equation #2. Once you figure out a, plug a in to equation #1 and find b.
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<span>24: 24, 48, 72, 96, 120,
144, 168, 192, 216, 240, <span>264, 288 ,312, 336, 360, 384,
408, 432, 456, 480, 504, 528, 552, 576, 600, 624, 648, 672, 696, 720, 744, 768,
792, 816, 840, 864, 888, 912, 936, 960, 984, 1008, 1032, 1056, 1080
</span></span>30: 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 360, 390, 420, 450,
480, 510, 540, 570, 600, 630, 660, 690, 720, 750, 780, 810, 840, 870, 900, 930,
960, 990, 1020, 1050, 1080
54: 54, 108, 162, 216, 270, 324, 378, 442, 486, 540, <span>594, 648, 702, 756, 810,
864, 918, 972, 1026, 1080
1080p.</span>
