Two straight lines have equations y = px + 4 and py = qx − 7, where and are constants. The two lines meet at the point (3, 1). What is the value of ?

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2≡−−7=0L2≡qx−py−7=0(3,1) is their point of intersection then(3,1) is their point of intersection then⟹3−1+4=0⟹3p−1+4=0=−1p=−1⟹(3)−(−1)(1)−7=0⟹q(3)−(−1)(1)−7=0=2

you should at least use a calculater

step-by-step explanation:

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.