Answer:
13. y = 4x - 4
y - 4x = -4
14. y = 5/3x + 5
y - 5/3 x = 5
3 × y - 3 × 5/3x = 3 × 5
3y - 5x = 15
15. y = -4/7x - 2
y + 4/7x = -2
7 × y + 7 × 4/7x = 7 × -2
7y + 4x = -14
16. y = x/-3 + 6
y - x/-3 = 6
-3 × y - -3 × x/-3 = -3 × 6
-3y - x = -18
17. 2x + y = 5
y = 5 - 2x
18. 3x - 2y = 6
-2y = 6 - 3x
-1(-2y = 6 - 3x)
2y = -6 + 3x
2y/2 = -6/2 + 3x/2
y = -3 + 3/2x
19. -x - 3y = 18
-3y = 18 + x
-3y/-3 = 18/-3 + x/-3
y = -6 + x/-3
20. 5x - y = 7
-y = 7 - 5x
-1(-y = 7 - 5x)
y = -7 + 5x
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Verified answer
Answer:
II.
13. y = 4x - 4
y - 4x = -4
-4x + y = -4 (E)
14. y = 5/3x + 5
y - 5/3 x = 5
3 × y - 3 × 5/3x = 3 × 5
3y - 5x = 15
-5x + 3y = 15 (B)
15. y = -4/7x - 2
y + 4/7x = -2
7 × y + 7 × 4/7x = 7 × -2
7y + 4x = -14
4x + 7y = -14 (D)
16. y = x/-3 + 6
y - x/-3 = 6
-3 × y - -3 × x/-3 = -3 × 6
-3y - x = -18
-x - 3y = -18 (A)
III.
17. 2x + y = 5
y = 5 - 2x
y = -2x + 5 (C)
18. 3x - 2y = 6
-2y = 6 - 3x
-1(-2y = 6 - 3x)
2y = -6 + 3x
2y/2 = -6/2 + 3x/2
y = -3 + 3/2x
y = 3/2x - 3 (A)
19. -x - 3y = 18
-3y = 18 + x
-3y/-3 = 18/-3 + x/-3
y = -6 + x/-3
y= x/-3 - 6 (B)
20. 5x - y = 7
-y = 7 - 5x
-1(-y = 7 - 5x)
y = -7 + 5x
y = 5x - 7 (F)