book Maths Puzzle Numerical Ability

please solve for x and y
y=-2x+6
y=x

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book Other Question

how do i solve: 1/8(16y+8)-17= -1/4(8y-16)
i need a step by step answer a boy is 5 years old, and his sister is twice as old. when the boy is 8 years, what will be the age of his sister?