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We need to find the correct answer on the given choices:
If a > 0 and b < 0, then The answer is a + b > 0
let’s give a specific example:
let’s have a = 1
and b = .20


Now, let’s try calculating if our answer is correct.
Thus a + b > 0
=> a + b
=> 1 + .20
=> 1.20
and 1.20 is greater than 0.
=>Therefore 1.20 > 0 = a + b > 0

Answered by taskmasters | 2024-06-10

The statement that must be true if a > 0 and b < 0 is that a - b > 0, as subtracting a negative number is identical to adding its positive counterpart, increasing the value of a. ;

Answered by utkarshsingh1281 | 2024-06-24

The only true statement from the options provided is C: 0"> a − b > 0 , as subtracting a negative b from a positive a results in a positive value. All other options do not hold true under the given conditions. Thus, Option C is chosen as the correct answer.
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Answered by taskmasters | 2025-03-07

Penjelasan dengan langkah-langkah:Misalkan :x = harga 1 pensily = harga 1 pulpen2x + 3y = 78.000 (×3)3x + 2y = 72.000 (×2)6x + 9y = 234.0006x + 4y = 144.000 _5y = 90.000y = 90.000/5y = 18.0003x + 2 (18.000) = 72.0003x + 36.000 = 72.0003x = 72.000 - 36.0003x = 36.000x = 36.000/3x = 12.000Jadi, harga sebuah pensil adalah Rp.12.000,00 dan harga sebuah pulpen adalah Rp.18.000,00.a. 5x + 5y = 5(12.000) + 5(18.000)= 60.000 + 90.000= 150.000Jadi, harga 5 pensil dan harga 5 pulpen adalah Rp.150.000,00.b. x + y = 12.000 + 18.000= 30.000Jadi, harga 1 pensil dan harga 1 pulpen adalah Rp.30.000,00.c. 2x + 2y = 2(12.000) + 2(18.000)= 24.000 + 36.000= 60.000Jadi, harga 2 pensil dan harga 2 pulpen adalah Rp.60.000,00.d. Jadi, harga sebuah pensil adalah Rp.12.000,00e. Jadi, harga sebuah pulpen adalah Rp.18.000,00.

Answered by arnymatematika | 2025-08-25