exam Maths Puzzle Numerical Ability

Please help me with problem. It says to Simplify this expression. And im doing distributive property. (4-z)(-1)

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exam Other Question

Help needed please. I am so lost with this question. Thank for any help given.

-3/5 + (8/35) =
Thank you.
Solve each system by substitution. check your answer.

y=x-2
y=4x+1