Word Problems on the system of equations: The sum of two numbers is twelve and the difference of two numbers is -4. Find these two numbers.

If there are twice the number of nickels”x” then there are quarters”y” and the amount of money is 1.75. Find the number of each coin.

let the two number be x and y then,

x+y=12

x-y=-4

2x=8

or, x = 4 put the value of x in first equation

4+y= 12

or, y=12-4

or, y= 8 hence the two number is 4 and 8

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.

x=6 and x=3

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