book
Maths Puzzle
Numerical Ability
solve by graphing.
#1
x-y=3
x+y=5
#2
x+2y=6
2x-3y=26
#3
x=2y+4
y=2x-8
#4
x=y-1
3y=-2x-x
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book Other Question
the sum of two numbers is 99. the difference of the two is 17. fin the numbers.
i dont get how you do this problem;5+(-2).