exam Maths Puzzle Numerical Ability

Solve the pairs of equations using the substitution method:
problem#6. x=1-y
y=x-9

problem#7. 2x-y=0
3x-2y=-3

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exam Other Question

Determine whether the following equations have a solution or not? Justify your answer
(7)1/2y2 - 6y - 13(7)1/2 = 0
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