2x + 3y = 45
X + Y = 10

What is the value of X of the solution for this system


2x+3y=45 x+y=10 Take the bottom equation and solve for y x+y=10 Subtract x from both sides y=-x+10 Substitute into the top equation 2x+3(-x+10)=45 2x-3x+30=45 Subtract 30 from both sides + add like terms -x=15 Divide both sides by -1 x=-15

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Make x the subject for equation (2): Substitute equation (2) into equation (1): Subsitute y = 25 into equation (2): Answer: x = -15

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