Solve the following system of equations using elimination 3x-4y=8 10x+5y=45

{3X-4Y=8
10X+5Y=45}
multiply both sides of the equation by 5,4
{5x3X-5x4Y=5x8
4x10X+4x5Y=4x45}
{15X-20Y=40
40X+20Y=180}
sum the equations vertically to eliminate one variable
55X=220
divide both sides by 55
X=4
plug in the value of X into the simplest equation which is 3X-4Y=8
3x4-4Y=8
solve for Y to get it's value
Y=1
so your answer will be (4,1)
plug in the value of (x,Y) which is (4,1) to both equation to make sure it's right

I hope this helps :)

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