exam Maths Puzzle Numerical Ability

Hi i need major help on how to solve an equation using the substitution method the equation is as follows {3x + y = 21,
10x +5y =65

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exam Other Question

In exercise 7-14, an eqyatuib abd two ordered pairs are given. Sho that each pair is a solution of the equation. Than graph the two pairs to determine another solution. Answer may Hello,

I was hoping you could help me solve this:

Find all zeros of P(x)= 2x^4-7x^3 - 10x^2 + 33x + 18 by using the Rational Zero Theorem, synthetic division and the quadrati