book Maths Puzzle Numerical Ability

CAN SOMEONE TEACH ME HOW TO DO LINEAR INEQUALITIES?
like - how do i find a boundry of a line?
ex. y>x y=____

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book Other Question

Christi's mother gave her $9.00 to buy .10 and .15 stamps. Christi returned with $1.75 in change and a total of 60 stamps. How many of each kind of stamp did she buy?

I need hel The surface area of a cube is 50 cm squared.
what is the area of one face of the cube? What is the length of one edge of the cube? How do you find the answer?