Well, a negative times a negative is the same thing as a positive times a positive, so you can basically turn the equation into:
7 x 11 + 22
7 x 11 = 77
77 +22 = 99
So, -7 x -11 + 22 = 99
Hope this helped. :]
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x-y = 6 -x-3y = 22 -4y = 28 y = -7 So by substituting: x = -1 and y = -7
15 + 14 + 14 + 11 + 2x + x = 75 Collect like terms 54 + 3x = 75 Subtract 54 3x = 21 Divide by 3 x = 7 ■
x=3 and y=4. you multiply x+y=7 by neg. 2 this way you can cancel out the y factors and get neg. 2x+x=-14+11 neg. x = neg. 3 divide both sides by neg. 1 to get x=3. use substitution to get y=4
y=7+x =x=7-x