Answer:
Explanation:
Let first number be x
Second number be y
According to the question, A first number plus twice a second number is 9 .
x + 2y = 9
x = 9 - 2y - - - - - (1).
Also Twice the first number plus the second totals 15
2x + y = 15 - - - - - (2).
Substitute equation (1) in equation (2),
→ 2x + y = 15
→ 2(9 - 2y) + y = 15
→ 18 - 4y + y = 15
→ 18 - 3y = 15
→ -3y = 15 - 18
→ -3y = -3
→ y = 1
Substitute the value of y in equation (1)
→ x = 9 - 2y
→ x = 9 - 2(1)
→ x = 9 - 2
→ x = 7
Hence, x = 7 and y = 1
Therefore, The required numbers are 7 and 1.