exam Maths Puzzle Numerical Ability

graph y=1/2x
x+y=3

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exam Other Question

How do you change slope intercept equation like y=-3/4x+3 into a standard equation? I need to see be steps how to solve this problem by the method of substition
the problem is
x = 4y+33
y = -2x-6
I need to solve for x and y