exam Maths Puzzle Numerical Ability

please help me solve this problem

use the substitution method to solve the linear system
here is the promblem

Y=x-4
3x-y=-8

what do you do frist

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exam Other Question

ok here is my problem

6x+3=2x+11

now what do i do with it. ive tried everything and cant seem to get the right answer. Plz help A plane travels 1800 miles against a headwind in 4 hours. The return trip, now with a tailwind, takes an hour less. What is the rate of speed of the wind?