SOLUTION: x+4y=-10 2x-y=7

Algebra ->  Expressions-with-variables -> SOLUTION: x+4y=-10 2x-y=7       Log On


   

Question 1158056: x+4y=-10
2x-y=7
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

x%2B4y=-10........eq.1
2x-y=7........eq.2
------------------------------
x%2B4y=-10........eq.1, solve for x
x=-10-4y........eq.1a..............substitute in eq.2
2%28-10-4y%29-y=7........eq.2, solve for y
-20-8y-y=7
-9y=7%2B20
-9y=27
y=27%2F-9
y=-3
go to
x=-10-4y........eq.1a, substitute y

x=-10-4%28-3%29
x=-10%2B12
x=2

+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+2x-7%2C+-x%2F4-10%2F4%29+