solve 0.4z-3/1.5z+9 =7/5
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10
Answer :
Now, (0.4z - 3)/(1.5z + 9) = 7/5
⇒ 5 (0.4z - 3) = 7 (1.5z + 9)
⇒ (5 × 0.4)z - (5 × 3) = (7 × 1.5)z + (7 × 9)
⇒ 2z - 15 = 10.5z + 63
⇒ 10.5z - 2z = - 15 - 63
⇒ 8.5z = - 78
⇒ z = - 156/17
∴ the required solution is z = - 156/17
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Now, (0.4z - 3)/(1.5z + 9) = 7/5
⇒ 5 (0.4z - 3) = 7 (1.5z + 9)
⇒ (5 × 0.4)z - (5 × 3) = (7 × 1.5)z + (7 × 9)
⇒ 2z - 15 = 10.5z + 63
⇒ 10.5z - 2z = - 15 - 63
⇒ 8.5z = - 78
⇒ z = - 156/17
∴ the required solution is z = - 156/17
#MarkAsBrainliest
Answered by
3
z is qual 156/17 because (0.4-3)×5=(1.5+9)×7
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