Answer:
x = -1 and y = 6
Step-by-step explanation:
y = x + 7
5x + 2y = 7
y - x = 7.............(1)
2y + 5x = 7......(2)
multiply equation (1) by 2
2y - 2x = 14
2y + 5x = 7
subtract equation (2) from (1)
2y - 2x = 14
- 2y + 5x = 7
-------------------
0 -7x = 7
-7x = 7
divide both sides by 7
-7x = 7
----- ----
7 7
-x = 1 multiply through by minus sign
x = -1
substitute x = -1 into equation (1)
y - x = 7
y - (-1) = 7
y + 1 = 7
y = 7 - 1
y = 6
There is a rule for finding perimetre of all polygons that perimetre is the sum of all the side's lengths ; according to this rule add the length of the sides of this polygon and you'll get the answer , the answer is the choice that you've written ( 2+3×2+5+6+7+9 ) or ( 2+3+3+5+6+7+9 ) both are correct because 3+3 is same as 3×2
perimetre is 2+3×2+5+6+7+9 = 35 units
HOPE IT HELPS
To answer this you will need to know that there are 43,560 square feet in 1 acre.
1. Half of this is 43560/2 or 21780 square feet.
2. Out of this amount Blake has already mowed 3/5 of the lawn. This means he must mow 2/5 (1 - 3/5) more.
2/5 of 21,780 ft.² can be represented this way:
2/5 x 21780 =?
He needs to mow 8712 ft.² more.
To know how to do this set up the question:
63/x = 60/100
63*100=60x
6300/60=x
x=105