Answer:
-4.5
Step-by-step explanation:
Answer:
5mph over the speed limit
Step-by-step explanation:
In 1 hour the man drove 210/3.5=60 miles. 60mph is over the speed limit (55) by 5 mph.
Answer:
<em>x=2 y=-9 over 7</em>
Step-by-step explanation:
<em>-3x+7y=15 solving for x (add -7 to both sides)</em>
<em>-3x=-7y-15 (divide both sides by -3)</em>
<em>x=7 over 3y+5</em>
<em>substitue the x above for x in the equation -2x-7y=5</em>
<em>-2(7 over 3y+5)-7y=5</em>
<em>-35 over 3y-10+5</em>
<em>y= -9 over 7</em>
<em>substitue the y above in the equation x= 7 over 3y+5</em>
<em>x=2</em>
<em />
<span>(Y-3)^2 = 4y -12 <=> Y^2 - 6Y + 9 = 4y - 12 <=> 4y = Y^2 - 6Y + 21 <=> y = (Y^2 - 6Y + 21)/4. Solving the equation for y means that we have to express y relative to the other quantities in the equation.</span>