Answer:
Step-by-step explanation:
x-y=7
-3x+9y=-39
Divide the second equation by 3
-x +3y = -13
Add this to the first equation
x-y=7
-x +3y = -13
----------------------
0x +2y = -6
Divide by 2
2y/2 = -6/2
y = -3
Now find x
x-y = 7
x -(-3) = 7
x+3 = 7
Subtract 3 from each side
x = 4
(4,-3)
Or by substitution
x-y=7
solve for x
x = 7+y
-3x+9y=-39
Substitute y+7 in for x
-3(7+y) +9y = -39
Distribute
-21 -3y +9y = -39
Combine like terms
-21 +6y = -39
Add 21 to each side
6y = -18
Answer:
$4
Step-by-step explanation:
I tried to make it as simple as possible.
Name three quaderlateral that only sometimes have right angle
Rhombus, trapezoid, and parallelogram
Answer:
7/13
Step-by-step explanation:
Arrange the numbers so that the number of girls in year 10 is the numerator, and the total number of girls is the denominator. (140/260) Simplify this by dividing both numbers by 20.
Answer:
20
25
50
15
40
10
45
30
35
5
50
40
15
10
45
20
25
35
30
5
15
25
50
40
35
45
5
20
10
30
5
15
20
40
10
50
35
30
25
45
10
50
35
30
15
5
40
20
45
25
25
15
45
5
20
10
50
35
30
40
35
50
40
15
20
45
5
25
30
10
15
25
20
10
35
5
45
50
40
30
10
35
30
50
20
5
15
40
45
25
50
20
30
45
15
40
25
10
5
35
Step-by-step explanation:
YOUR WELCOME (this too forever pls name me brainliest)
