maria241432
22.04.2020 •
Mathematics
Which of the following equations have the same solution? Give reasons for your answer that do not depend on solving the equations?
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Ответ:
a and f
Step-by-step explanation:
a. x + 3 = 5x - 4
x - 5x = -4 - 3
-4x = -7
x = -7/-4
x = 7/4
b. x - 3 = 5x + 4
x - 5x = 4 - 3
-4x = 1
x = -1/4
c. 2x + 8 = 5x - 3
2x - 5x = -3 - 8
-3x = -11
x = -11/-3
x = 11/3
d. 10x + 6 = 2x - 8
10x - 2x = -8 - 6
8x = -14
x = -14/8
e. 10x - 8 = 2x + 6
10x - 2x = 6 + 8
8x = 14
x = 14/8
f. 0.3 + x/10 = 1/2x - 0.4
3/10 + x/10 = 1/2x - 4/10
x/10 - 1/2x = -3/10 - 4/10
x/10 - 5/10x = -7/10
-4x/10 = -7/10
-4x = -7
x = -7/-4
x = 7/4
Ответ:
18 6/7
Step-by-step explanation: