exam Maths Puzzle Numerical Ability

Please help me solve this equation. It has been awhile.
3/4 + 7/y = 9

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exam Other Question

use cramers rule or to determine that the system is inconsistent or contains dependent equations:

2x+y=3
x-y=3 I have a problem

If f(x)=x(x+1)(x-4) use interval notation to give all values of x where f(x)>0