Question 180766
a)

Just change the 5 to something else. So other equation is 2x-y=7


b)

Multiply all numbers by 2. So equation is 4x-2y=10


c)


Make up 2 numbers for left side. So I chose 4 and 5. Left side is now 4x+5y


Plug in (3,1) -----> 4(3)+5(1)=12+5=17


Equation is 4x+5y=17