Algebramedium · Past Paper
If 0.4x + 0.3y = 1.7 and 0.7x - 0.2y = 0.8, find x.
A1
B2
C3
D4
✓ Correct Answer: B — 2
Multiply by 10: 4x+3y=17, 7x-2y=8. Multiply eq1 by 2, eq2 by 3: 8x+6y=34, 21x-6y=24. Adding: 29x=58 -> x=2.
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✓ Correct Answer: B — 2
Multiply by 10: 4x+3y=17, 7x-2y=8. Multiply eq1 by 2, eq2 by 3: 8x+6y=34, 21x-6y=24. Adding: 29x=58 -> x=2.
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