write a linear equation that represents thee situation

a rock-climing facility offers lessons for $20 per half-hour session, plus a full-day equipment rentalof $7
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The rental of equipment is a fixed charge that represents a starting cost, no matter how long the session. If T is the time in half-hour units, then the cost per unit is $20.
If C is the cost then facility charges C=20T+7 in dollars per day.
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