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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Dr. Tydings has found that over the years 95% of the babies that she has delivered have weighed y lb, where (y-8.0)is less than or equal to 1.5. What range of weights corresponds t Find the slope and the y-intercept.
y = 4x - 2

The answer I came up for this one is 2 for the slope. Is this correct? If not could you show me what I did wrong and explain how to find the slope and y-intercept. Thanks for your time and help.