book Maths Puzzle Numerical Ability

how do you answer an equation in an ordered pair?

5x+5y=0
3x+y=-10

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book Other Question

identify the number of terms in each algebraic expressions
1.3xcubed 4
2.-42+x
3.xsquared 2+2xy+y squared 2
4.x+1
5.(m+n+p)squared 2
6.(a+b)
7.(x-y)(x+y)
8.4m-5n+3p+21
9.2 If the perimeter is 54, and the width is half the size of the length, then how would you solve for the length and width?