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Elden [556K]
3 years ago
12

How do you make 'a' the subject of the formula: ab - cd = ac

Mathematics
1 answer:
xxTIMURxx [149]3 years ago
3 0
First bring all terms in 'a' to the left side of the formula by subtracting ac from both sides

ab - ac - cd = ac - ac 
ab - ac - cd = 0
now add cd to both sides
ab - ac -cd + cd = cd
ab - ac = cd
now factor the left side by taking out the 'a' 
a(b-c) = cd
now divide both sides by (b-c)
a = cd / (b-c)
done

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I neeeed help realy bad
77julia77 [94]

Answer: -3x + 4, (2,-2)

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     -y     -y       subtract y to get it alone on the right side.

Your'e left with 3x - 4 = -y      divide the whole equation by -1 do get a pos y

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To get the second part plug in (-3x + 4) into the y of the first equation, this is the substitution part.

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Isolate your x by subtracting the 20, both sides  -20   -20

-17x = -34    divide both side by 17 you get x = 2 (---- this is your first coordinate in the pair in your answer. To get the y do the same but solve for y instead of x.

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