The price could have been 6 each or 9 for one and 3 for the other
Answer:
Step-by-step explanation:
The given equations are:
2a+7b=0 and 3a-5b=31
Statement Reason
1. 10a+35b=0, 21a-35b=217 (Multiply first equation by 5 and second by 7)
2. 31a=217 (Adding both the equations)
3. a=7 (Dividing both sides by 31)
4. 2(7)+7b=0 (Substituting a=7 in first equation)
5.14+7b=0 (solving step 4)
6. 7b=-14 (Subtracting 14 on both sides)
Answer:
y=1/3x-6
Step-by-step explanation:
x-3y=18
3y=x-18
y=1/3x-18/3
y=1/3x-6
8.40/3 = £2.80 each
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