Question

You want new picture frames that cost $12 each. Shipping is $8 per order. If you buy 15 frames, what is the cost of the order?

Answer 1

Equations, equations, equations.
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I mean, c'mon. Why equations?
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Becuz we have to.
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So. 
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Shipping is $8. Set value. Doesn't change!!
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Our equation begins with $8.
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One frame, $12. 
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Let x be amount of frames!
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Thus we now have $8 +  $12x.
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Total?
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Let y be amount in all.
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$8 + $12x = y.
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Plug in our value.
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$8 + $12 x 15 = y.
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What's 12 x 15?
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You got it. 180.
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180 + 8?
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188.
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You got it!! In all, 188 dollars.
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Phew. Pretty expensive, huh?
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Hope I helped!!

Answer 2

12*15+8 is your equation. 12*15=180 180+8=188 answer is 188 because all of them combined is one order.