Theres a formula to find the midpoint it’s... (x1+x2)/2, (y1+y2)/2. You fill in the x’s and y’s to get (-5+7)/2 for x, which equals 1 and (4-5)/2 to get -0.5. (1, -0.5) is your answer
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what is question of this you asked
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3 miles and then 3 per mile for each additional mile
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they are equal because while solving 2b+5+1b it will come 3b+5 so they are equal