exam Maths Puzzle Numerical Ability

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

McGraw Hill 6th edtion, chapter 7.5 exercise #18
Thanks for your time!!!!

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exam Other Question

Find the coordinates of the vertices of the figures formed by:
y<=x+2, x+y<=6, and y>=-2.

Thank You 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!