7x+3y where x=2 and y=9 can be written as (7*2)+(3*9) which can be simplified to (14)+(27), from there it's basic addition.
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x+7x+3y-y =8x+2y =2(4x+y)
1. 4x + 3y = -22. x - y = -4Multiplying 2. by 3 gives: (we have done this so that we end up with a -3y)3. 3x - 3y = -121. added to 3. gives: (now, by adding, the 3y & -3y will cancel out)4. 7x = -14 (the 4x + the 3x gives 7x, the y's cancel out, -2 + -12 gives -14)thus x = -14/7x = -2Substituting x = -2 into 1. gives(4 * -2) + 3y = -2-8 + 3y = -23y = -2 + 83y = 6y = 2Thus x = -2 and y = 2.
-4(7x-3y-z)-(-6)(9x-z+2)
7x + 2 = 5,6
X=4.2666666666667