exam Maths Puzzle Numerical Ability

Janet kim is now 13 years old, her father is now 31

write an equation stating that jeong is twice as old as janet, then solve it to find out when jeong is twice as old as janet

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exam Other Question

Explain why the graph of |x| + |y| = 1 does not contain any points that have
a. a y-coordinate that is greater than 1 or less than -1

b. an x- coordinate that is geater than 1 or less than -1 what does my teacher mean when she says to solve an equation in one variable and to solve products;quotients?