book Maths Puzzle Numerical Ability

WHICH IS THE SOLUTION OF THE SYSTEM GIVEN BELOW?

Y=-X+2
Y=-X-5

A. (2,1) B. (2,5)
C. NO SOLUTION D. INFINITELY MANY SOLUTIONS

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book Other Question

when given a number of points (i.e 2) the number of lines to join the points is 1. 3 points require 3 lines, 5 points require 10 lines. how would i express this in an algebraic f I am stumped on this question. Can someone please help me with it.

Find the equation, in standard form, including all integer coefficients, of the line perpendicular to 3x - 4y = 9 and passing through (-2, -1).