Question

Plss tolong di bantu Di substitusikan! 1-5 g ngerti aku tolong plsss

Answer 1

1. y = 2x

x + 3y = -21
x + 3(2x) = -21
x + 6x = -21
7x = -21
x = -1

y = 2x
y = 2(-1)
y = -2

2.
2x = y-10
y = 2x + 10

x = 2y +8
x = 2(2x + 10) + 8
x = 4x + 20 + 8
-3x = 28
x = -9,3

y = 2x + 10
y = 2(-9,3) +10
y = -18,6 + 10
y = -8,6

3. x = y +10
x = 2y + 8

2y + 8= y + 10
y = 2

x = y + 10
x = 2 + 10
x = 12

4. 2x + 2y = 5 | 2x = 5 - 2y
4x - 3y = - 18
2(5-2y) - 3y = -18
10 - 4y -3y = -18
-7y = -28
y = 4

2x = 5 - 2y
2x = 5 - 2(4)
2x = 5 -8
2x = -3
x = -3/2
x = -1,5

5. x - 3y = 5 | x = 5 + 3y
3x + 2y = 4
3 (5 + 3y) + 2y = 4
15 + 9y + 2y = 4
11y = -11
y = -1

x = 5+3y
x = 5 + 3(-1)
x = 5 + (-3)
x = 2