exam Maths Puzzle Numerical Ability

i KNOW THAT THIS IS PROBABLY A SIMPLY ONE BUT iM HAVING A TIME TRYING TO FIGURE HOW TO GET THE CORRECT ANSWER. DMVT math student.

SOLVE FOR B: AX+BY=C. how do you get an answer from this?

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exam Other Question
f(x)=x2-4 The vector v=[4 5] can be written as a linear combination of the vectors v1=[1 3] and v2=[4 -2] by letting c1=? and c2=?. Find c1 and c2 to solve.