<p>tx + 12y = -3</p>
<li>The equation above is the equation of a line in the xy-plane, and t is a constant. If the slope of the line is -10, what is the value of t?</li>
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<p>(Answer is 120)</p>
<p>rearrange into y = mx + b ---> y = -tx/12 - 3/12</p>
<p>you know m = -10 ---> -t/12 = -10</p>
<p>multiply by -12 ---> t = 120</p>