To solve for all of your problems you could use substitution, elimination, or graphing. An example of substitution would be like this X+5Y=8 X-X+5Y=8-X 5Y=8-X 5Y/5=8-X/5 Y=8-X/5 Now since we put our equation to solve for Y we can plug that equation into 2X-5Y=1. 2X-5(8-X/5)=1 2X-40+5X/-25=1 X=3
1. x+5y=8 2x- 5y=1 What you do is find the number/variable that are the same( here is is the +5y and -5y. You want them to be opposites(-,+) so that they cancel each other out. if they are not opposites, then multiply one equation by a negative sign to change it. Cross out the 5y's. Now you can combine like terms-x+2x=3x, and 8+1=9, so now your equation will look like this: 3x=9 x=9/3 x=3 now take x=3 and plug it into the first equation to solve for y. x+5y=8, so 3+5y=8 5y=8-3 5y=5 y=5/5 y=1 (3,1) are your answers. now do the same with the other problems.
