exam Maths Puzzle Numerical Ability

graph a linear function
f(x)=4x-5

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exam Other Question

im havig trouble understanding how to do this problem , could you show me how to do this?

-1/2 -3/2
(x+5) - (x+5) I've been trying to solve an equation that carries 3 variables with three lines.

2/3x-1/6y+1/2z=11/2
5/6x+3/4y-1/12z+1/4=0
1/4x+5/6y=9/4-2/3z

I've turned this int