exam Maths Puzzle Numerical Ability

solve the system using the substitution method. present as an ordered method. If not, specify whether the answer is no solution or infinite many solution
4x + y=4
2x + 8y=0

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exam Other Question
Solve by the elimination method.
3x + 4y = 3
6x + 8y = 6

Can someone please help me with this. I was doing really well with my work but now am stuck again. Help me please. Graph the function.
16)
f(x) =
4x + 2 if x < -2
x if -2 &#8804; x &#8804; 3
3x-1 if x > 3