exam Maths Puzzle Numerical Ability

HI!
please help me with finding this equation

find the equation for the line parallel to 2x-3y+6=0, with the same y intercept as y=7x-1

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exam Other Question

If f(x) = 4x - 3, find the following:

f(-1)

Can you show me how to figure this, I do not understand.

Thank you. A grocer wants to mix together some cashews costing $8 per kilogram with some Brazil nuuts costing $10 per kilogram. The grocer wants to sell 12 kg of the mixture for $8.50 per kil