Question: Prepping to help son with math homework tonight -- this assignment has an answer key, but I need to understand how to get to those

Prepping to help son with math homework tonight -- this assignment has an answer key, but I need to understand how to get to those answers -- thank you!

Prepping to help son with math homework tonight
Solve each system by substitution. 10. Jy=-3x+4 11. J)= -4x+2 y= 4x-10 y = 6x -8 12 . )= 3x-4 )= x-4 4x + 3y=1 13. 4x-6y=-16 14. x= 3y+1 X=Y-4 2x + 4y = 12 15. -2x + 3y =6 16. Next week your math teacher is giving a chapter test. The test will consist of 35 questions. Some problems are worth 2 points and some problems are worth 4 points. There are 20 questions worth 2 points. How many problems of 4 points are on the test

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