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24 September, 06:29
Write three equations whose solution is x=3.5
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Luka Nguyen
24 September, 07:52
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1. 2x + 23 = 30 2. 3x + 19.5 = 30 3. (10x - 20) / 5 = 3
Explanation:
Work backward:
1. 2x + 23 = 30
Start:
x = 3.5
Multiply the equation by 2:
2x = 2 (3.5) 2x = 7
Subtract 30 from both sides
2x - 30 = 7 - 30 2x - 30 = - 23
Add 23 and 30 to both sides:
2x + 23 = 30
2. 3x + 19.5 = 30
Start:
x = 3.5
Add 6.5 to both sides:
x + 6.5 = 10
Multiply by 3:
3 (x + 6.5) = 30
Distributive property:
3x + 19.5 = 30
3. (10x - 20) / 5 = 3
Start:
x=3.5
Multiply by 10:
10x = 35
Subtract 20:
10x - 20 = 15
Divide by 5:
(10x - 20) / 5 = 15/5
(10x - 20) / 5 = 3
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