Brainliest plus 30 points
do question 15a
hint the answer is x equal four and y equal two
show full owrking out

x = 4 and y =2

Step-by-step explanation:

Because we are given that x+3y = 10

and the perimeter gien is 54 cm so:

Subtract both sides that equal to 10 + 10 =20 from 54, we get:

54 -20 = 34

We got:

3x - y up and 7x - 2y down so when we add it together, we got:

10x -3y = left perimeter after subtract 20 = 34

We got:

x + 3y = 10 (1)

10x - 3y = 34 (2)

Add (1) and (2) together, we got:

11x = 34 +10

11x = 44

Divide both sides by 11, we got:

x = 4

We know now x = 4, change 4 into x + 3y =10 to get y so we got:

x + 3y =10

4 + 3y = 10

Subtract 4 from both sides, we got:

3y = 6

Divide both sides by 3, we got:

y = 2

So x = 4 and y =2

Hope this helped:3

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.

17

step-by-step explanation: