exam Maths Puzzle Numerical Ability

graph f(x)= -x-2 do I first go like (0,-2) and (-2,0) then graph

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exam Other Question

Solve the system of equation by graphing.
1.)
-7x + y = -8
-3x + y = -12

2.) 2x - 3y = 5
9y = 6x - 15 please solve this system of equations

2^(5x+y)=0.25^(x-2y+3/2)
log(x-y)=1/log5+log2

find {{{x}}}and {{{y}}}