exam Maths Puzzle Numerical Ability

m=y2-y1/x2-x1
How do I know how to know the ecuation for x1?

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exam Other Question

the problem is:

GRAPE
- PLUM
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APPLE USING 0,1,2,4,6,7,8,9
Complete the ordered pairs so that each is a solution for the given equation.

Equation:
y = -2x + 5

Availble ordered pairs:

(0, ), ( , 5), ( 3/2, ), ( ,1)

Not sure I understand this one. Thanks for the help.