Caleb buys fencing for his yard.

He pays $122 for 5 fence posts and 4 fence panels

He pays $570 for 21 fence posts and 20 fence panels.

How much does he pay for 4 fence posts and 3 fence panels? Show how you figured it out.

$94

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122 = 5p + 4f

570 = 21p + 20f

f = 18

p = 10

the cost per post is $10, and the cost per fence panel is $18

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If Caleb has $700 what is the largest fence he can build?