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3 years ago

7

Evaluate ab-0.5b a=1 b=5

1 answer:

amid [387]3 years ago

3 0

Answer:

2.5

Step-by-step explanation:

1(5)-0.5(5)=5-2.5=2.5

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3 years ago

what is the y- coordinate of the y- intercept of the line that passes through the points (-4,-4) and (4,8)

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$\bf \begin{array}{ccccccccc}
&&x_1&&y_1&&x_2&&y_2\\
% (a,b)
&&(~ -4 &,& -4~) 
% (c,d)
&&(~ 4 &,& 8~)
\end{array}
\\\\\\
% slope = m
slope = m\implies 
\cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{8-(-4)}{4-(-4)}\implies \cfrac{8+4}{4+4}\implies \cfrac{12}{8}\implies \cfrac{3}{2}$

$\bf \stackrel{\textit{point-slope form}}{y- y_1= m(x- x_1)}y-(-4)=\cfrac{3}{2}[x-(-4)]
\\\\\\
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notice the slope-intercept form, that's the y-coordinate.

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3 years ago