exam Maths Puzzle Numerical Ability

please explain how i use y=2x+1 on a garft,to fined the variable y or x.

thank you robin

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exam Other Question

Claire bought three bars of soap and five sponges for $2.31. Steve bought five bars of soap and three sponges for $3.05. Find the cost of each item.
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can you solve using the quadratic formula
x^2+6x-8=0