Solve this system of equation using any method. 4x-y=5 and 3x+y=16
2 answers:
Multiply 4x-y=5 by 3 (everything so it would be 12x -3y =15. multiply 3x +y = 16 by 4 (12x- 4y = 64) set it up like an elimination problem 12x -3y =15 -12x-4y =64 ---------------- 1x = -49 x= -49 plug x back into the original equation-----> 4(-49) -y =5 -169 -y = 5 +169. +169 x = 174 Answer is (174, -49) I think, check my work
Since one equation has a positive y and the other a negative value, the simplest way is to add together the two equation to cancel out y first... (4x-y=5)+(3x+y=16) 7x=21 now divide both sides by 7 x=3, and use either original equation to solve for y... 3(3)+y=16 9+y=16 y=7 So the solution is the point (3,7)
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