exam Maths Puzzle Numerical Ability

Solve by substitution. Please help.
8x-4y = 16
y = 2x -4
Thanks in advance.

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exam Other Question

solve the following equation
3/z-3 + 5/z-1 = 8/z-2
A) z=-4
B) z=-6
C) z=4
D) z=6 Solve the following of linear equatins by graphing

x+2y<3
2x-3y<6

Please help