add the following polynomials

Question

7x-6y-5;-10x+8y+12;15x-6y;4x-2y-9

Answer 1

The sum of x terms is (7-10+15+4)x=16x. The sum of the y terms is (-6+8-6-2)y=-6y. The constants add up to (-5+12-9)=-2. So the polynomial is 16x-6y-2.

Answer 2

Given 7x-6y-5=0........(1)
-10x+8y=-12......(2)

Substitute x value from equation (1) in equation (2)
and find x and y value
x=8 and y=17/2

15x-6y;......(1)
4x-2y-9.....(2)

Substitute x value from equation (1) in equation (2)
And find x and y value
x=-9 and y=-45/2

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