Please answer any question from 5 to 12 and I promise to mark your answer as the brainliest
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Answer:
10) 3x - 8y = 0
7) a = 4
Step-by-step explanation:
10) Take pencils as x
And erasers as y.
Cost of 3 pencils = Cost of 8 erasers.
= 3x = 8y
= 3x - 8y = 0
7) x = 2, y = 1
Substitute these values in the equation you get,
9x - 3ay = 6
= 9 (2) - 3 (1) a = 6
= 18 - 3a = 6
= - 3a = 6 - 18
= - 3a = -12
= a = 4
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