Question 938403
the standard slope-intercept form for an equation of a line is 
{{{y = highlight_green(m)x + highlight(b)}}}  where m is the slope and b the y-intercept.  
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4) {{{y = highlight_green(3)x + highlight(2)}}}  P(0,2) and P(1,5) on this line
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5) y = (1/10)x  P(0,0) and P(5, 1/2) on this line
m = 1/10 , y-intercept = 0
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{{{drawing(300,300,   -6, 6, -6, 6, grid(1),
circle(0, 2,0.3),
circle(1,5, 0.3),
circle(5,.5, 0.3),
circle(0,0, 0.3),
graph( 300, 300, -6, 6, -6, 6,0, 3x+2, x/10) )}}}