exam Maths Puzzle Numerical Ability

need help could u explain each step thanks

2x-y=6
x=13-2y equations by substitution

thank you so much homework

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Find the real zeros of P(x) = x^4 - x^3 - 18x^2 + 52x - 40. If a zero is a multiple zero, state its multiplicity. Two buses leave Houston at the same time and travel in oppisite direction. One bus averages 55 mi/h and the other bus averages 45 mi/h. When will they be 400 mi apart?