exam Maths Puzzle Numerical Ability

Write an equation in standard form using intergers.

y=-3/4x-4 this is what ive tried so far
y=-3/4x-4

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exam Other Question

Solve by substitution or elimination and specify which method you did:
6x + 2y = 10
5x - 3y = 27

(PS: Please show how you worked it out. I have been having mojor problems with these kinds of questions. Thanks.)
A robin is flying south for the winter at a rate of 40 mph when it runs into a hurricane, blowing due west at 100 mph. What is the new velocity of the robin?