can you please help, and show me the easysubstitionorelimination method,not grap

Question

can you please help, and show me the easysubstitionorelimination method,not graph method 1)2m+n= 7      m-8n=63     ineed to find the ordered pair for x+ y on all three problems andhave difficulty 2)9x+8y=18     -3x+y= 27 3)solve the following b system of equation:   x+8y=7      (1)                                                                   x=3-8y       (2)          THANK YOU can you please help, and show me the easysubstitionorelimination method,not graph method 1)2m+n= 7      m-8n=63     ineed to find the ordered pair for x+ y on all three problems andhave difficulty 2)9x+8y=18     -3x+y= 27 3)solve the following b system of equation:   x+8y=7      (1)                                                                   x=3-8y       (2)          THANK YOU

Explanation / Answer

First you need to solve for one variable in one of the twoequations. For example, 3x+4y=5 x-y=4 I would use the easiest equation to solve: Step 1: using the second equation, I find that x = y+4; Step 2: plug that result into the first equation for the xvariable, 3(y+4)+4y=5 Step 3: Solve for other variable 'y', 3y+12+4y=5 ==>7y+12=5 ==> 7y = -7 ==> y = -1 Step 4: Plug the result from step 3 into either equation(usually take the easier equation), x-(-1)=4 ==> x+1=4 ==>x=3 Step 5: your ordered pair where these two lines intersect is(3, -1) I could have answered all three, but I was told to show youhow to do it only. Please rate.

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