Question

2x + 5y= -4
4x - 5y = 22

What is the solution to the above system of equations?

Answer 1

METHOD OF SUBSTITUTION AND ELIMINATION !
step 1 ELIMINATION of any variable x or y
2x + 5y= -4 *2
4x - 5y = 22 *1

4x+10y=-8
4x - 5y = 22
- + - reverse the operator symbol
0x+15y=-30
y=-30/15=-2
step 2 SUBSTITUTION
2x+5*-2=-4
2x-10=-4
2x=6
x=3. & y=-2

Answer 2

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