exam Maths Puzzle Numerical Ability

y= x + 3
y= 4x -3

solve each system using substitution

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exam Other Question

You have at least $30 in change in your drawer, consisting of dimes, and quaters. Write an inequality that shows the different numbers of coins in your drawer. i cant figure out thi problem and as wondering if you could help me out on it.
f[x]=-xSq.+9x-5 there is four answers a[-9over2,-263over4] b[9,5 ] c[9over2,61over4] d[9over2,101over4] i think it might be c but iam stuck