exam Maths Puzzle Numerical Ability

Having a little trouble
Ive tried to figure it out and doesnt make sense, thank you!

Solve by substitiution or addition
1eq)x=3y+4
2eq)y=6-2x

Again thank you!

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exam Other Question

Rewrite each equation as a function of x.
-3x+4y+11

McGraw Hill 6th edtion, chapter 7.5 exercise #18
Thanks for your time!!!! PLease help me solve this equation.I am suck.
A line is located at (1,3) and (4,-2).Where is the slope.
I got -5/3
Thank YOu!