book Maths Puzzle Numerical Ability

how would you do this please show me {4a+2u+i=2
{5a+3u+2i=17
{ a-5u =3

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book Other Question

in words, write out the steps necessary to solve for x in each of the following equations if you were given the values for the other variables.

x=tb
x=y tho the 3rd power+w to
Solve the proportion please:

y+4/y-1 = 4/3