exam Maths Puzzle Numerical Ability

AN EIGHTEEN OUNCE BOX OF RICE COST $2.48. WRITE THE UNIT RATIO OF PRICE TO WEIGHT.

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30) If f(x)=4x-3 find the following f(-1)

I am not sure how to solve this problem can someone please help me out.

thanks 8x-5y=-9,3x+5y=-2