exam Maths Puzzle Numerical Ability

many likes to buy two different kinds of strings for the guitar . the slinky costs $3.50 for each set and the slippys cost $4.50 for each set. how many of the slippys did he buy if he spent $41 ona total of $10 sets of strings.

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exam Other Question
which equation describes a line with a slope of 4 and a y-intercept of -3?

a.)4x+y=3
b.)4x-y=-3
c.)4x-y=-3
d.)4x+y=3 not in book.

4x-5<7x+10

x>-5

Is this correct?

and

2(5a-4)-3(6+2a)<6

I think a<8. Im i doing these correct?