Q.4 Solve by elimination:
3x - y - 7
2x + 5y + 1 = 0
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Answer:
Here, the given equations are
3x - y = 7 ...(i)
2x + 5y = - 1 ...(ii)
Now, multiplying (i) by 5 and (ii) by (-1), we get
15x - 5y = 35
- 2x - 5y = 1
On subtraction, we get
17x = 34
⇒ x = 34/17
⇒ x = 2
Now, putting x = 2 in (i), we get
3 (2) - y = 7
⇒ 6 - y = 7
⇒ y = 6 - 7
⇒ y = - 1
Hence, the required solution be
x = 2 and y = - 1
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