You combine like terms, meaning add or subtracts the numbers that have the same variables. In this case you leave 6xy alone since there’s no other number with xy. You also leave -8x alone. You combine -20y and +25y since they have the same variable, and when you do that, you get 5y. And finally, you combine +7z and -11z since they have z in common and when you do so, you get -4z. The final answer put together will be:6xy-8x+5y-4z
<span>ow we can use this in a linear equation for a slope
Ty = -5x/8 +5(3)/8 +8/8
= -5x/8 +(15+8)/8
= -5x/8 +23/8
this will gives us an approximation at x=2.8 now</span>
