Question 623677
Line X has a slope of 3. The line passes through Point X at (-2,-1) and also passes through Point Z., which has an x-coordinate of 0. What are the coordinates of Point Z?
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Step 1:  Use the point and y = mx + b to find b, the y-intercept
-1 = 3*(-2) + b
b = 5
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That makes the eqn of the line thru the point
y = 3x + 5
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Sub 0 for x
--> y = 5
Point Z is (0,5)