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1. The difference between two numbers is 7. If their

Berikut ini adalah pertanyaan dari gabriellanataliewija pada mata pelajaran Matematika untuk jenjang Sekolah Menengah Pertama

1. The difference between two numbers is 7. If their sum is 25, find the two numbers by forming two equations and simultaneously by elimination method.2. Find the x and y of the following diagram. (photo is attached)

3. A man's age is three times his son's age. 10 years ago he was five times his son's age by forming two equations and solving them simultaneously find both of their present ages by substitution method.​
1. The difference between two numbers is 7. If their sum is 25, find the two numbers by forming two equations and simultaneously by elimination method.2. Find the x and y of the following diagram. (photo is attached)3. A man's age is three times his son's age. 10 years ago he was five times his son's age by forming two equations and solving them simultaneously find both of their present ages by substitution method.​

Jawaban dan Penjelasan

Berikut ini adalah pilihan jawaban terbaik dari pertanyaan diatas.

Jawaban:

y=3 dan x = 4

Penjelasan dengan langkah-langkah:

and this answer for number 2

to find the x and y of the following diagram

Jawab:1. 16 and 92. x = 4 and y = 33. man = 60 years and son = 20 yearsPenjelasan:1.a - b = 7a + b = 25----------------- +2a = 32a = 32/2 a = 16a - b = 7a + b = 25----------------- --2b = -18b = -18/-2b = 9So, a = 16 and b = 92.x + 3y = 13x + y = 7------------------ -2y = 6y = 6/2 = 3substittute y = 3 into x + y = 7x + y = 7x + (3) = 7x = 7 - 3 = 4So, x = 4 and y = 33. man = 3 x son* 10 years ago:(man - 10) = 5 x (son - 10)substitute (man = 3 x son) into (man - 10) = 5 x (son - 10)(man - 10) = 5 x (son - 10)(3son - 10) = 5son - 503son - 5son = -50 + 10-2 son = -40son = -40/-2son = 20 yearssubstitute son = 20 into man = 3 x sonman = 3 x sonman = 3 x (20)man = 60 yearsSo, the present age of the man is 60 years and the son is 20 years

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Last Update: Thu, 19 May 22
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