book Maths Puzzle Numerical Ability

What is the equation in standard form y=mx =c

To Y-3x + 1=

AND THEN what is the y-intercept of the equation?

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book Other Question

write a system of linear equations and solve. How many pounds of bird feed at $1.68 and $.83 per pound must be purchased to have 100 pouns of bird feed at a value of $1.34 per pound? I wanted to know how to solve x-1 is less than or equal to 2x+4 which is less than or equal to 3x-1. Thank you