exam Maths Puzzle Numerical Ability

Please help me solve for I2 this equation: {{{ 3I1-4I2=17 }}} and {{{ I1+3I2 = -3}}} The I1 and I2 (1 and 2 are on the lower right hand corner of the I's)

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please help to graph on a number line :

x + 4 < or equal to 2 or x - 4 is NOT < or equal to -1, d = reals Which term prevents the following expression from being considered polynomial?

F(x)= 1/√2 x^4-1/√5 x^3-7x^-2+1.4x+21

A. -7x-2
B. 1/√2 x^4
C. -1/√5 x^3
D. 1.4x
E. 21