Grade 9 Math: Linear Relations and Equations Point-slope Form, Linear Equations

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How do you know that the following is a linear equation? $$y = \frac{mx}{2} + b$$

The exponent on x is 1.
You could never really know by this limited amount of information
It's a fraction.
it starts with y
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Which of the following is the point-slope form?

$$y=mx+b$$
$$ax+by=c$$
$$y-y_1=m(x-x_1$$
none of the above
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Find the slope, given the following coordinates: $$(2,4)(4,7)$$

$$\frac{3}{2}$$
$$\frac{2}{3}$$
$${3}$$
$${2}$$
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Find the slope, given the following coordinates: $$(5,3)(1,8)$$

$$\frac{4}{5}$$
$${4}$$
$${5}$$
$$\frac{5}{4}$$
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What is the slope-intercept form giving the following coordinates: $$(6,3)(1,1)$$

$$y=\frac{5}{2}x+\frac{3}{5}$$
$$y=\frac{2}{5}x+\frac{3}{5}$$
$$y=\frac{2}{5}x+\frac{5}{3}$$
$$y=\frac{2}{5}x-\frac{3}{5}$$
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