System of Equations

Algebra Level 1

If a-b = 10 , b-c = -8 , what is c-a?


The answer is -2.

Math Man by math man , 20, Indonesia

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4 solutions

Sakshi Taparia
Jan 3, 2015

add both equations, b gets cancelled and we get a-c=2 or c-a=-2

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Rishabh Kumar
Jan 3, 2015

a-b =10
or, a=b+10
and b-c = -8
or, c = b+8
so, c - a = (b+8) - (b+10) = -2



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a-b+b-c=10-8

a-c=2

c-a=-2

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Opi Dipto
Jan 4, 2015

a-b = 10, b-c = -8 If I add these equations, then I'll get..... (a-b) + (b-c) = 10 - 8 => a-c = 2 => c-a = -2

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