jika 2a + 3b = 18 dan a-b = 2, maka nilai a dan b adalah
Answer (3)
40% from 25 is:
25 * 40% = = 25 * 40/100 = = 25 * 4/10 = = 25 * 0,4 = = 10
Another way is to find 1% of 25 and then multiply it by 40:
25 * 40% = = (25 / 100) * 40 = = 0,25 * 40 = = 10
40% of 25 is calculated by converting 40% to a decimal and multiplying it by 25. This results in 10. Alternatively, finding 1% of 25 and multiplying it by 40 gives the same result.
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Jawaban:2a + 3b = 18 ...... pers (1)a - b = 2 ........ pers (2)metode substitusia-b = 2a = 2 + b ...... pers (3)substitusi a = 2+b ke pers (1)2a + 3b = 182(2+b) + 3b = 184+2b+3b = 184+ 5b = 185b = 18 - 45b = 14b = 14/5substitusi nilai b ke pers (3)a = 2+ ba = 2 + 14/5a = 2/1 + 14/5a = 2×5/1×5 + 1×14/1×5a = 10/5 + 14/5a = 24/5Penjelasan dengan langkah-langkah:nilai a = 24/5 dan nilai b = 14/5
