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| Then you sub. b=c-4 into b+d+f=30. c-4=d+f=30. Add 4 to each side so now we have c+d+f=34. | |
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| Next, you sub in c+d=e into the equation: e+f=34 so f=a+3. e+a+e=34 so a=4. 2e+4=34 (subtract 4 from each side) 2e=30 so we now know that e=15 | |
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| Oh so by substituting values, that enabled you into creating formulas. | |
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| Exactly, but we're not done. h-e=7, h-15=7 therefore h=22! | |
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