exam Maths Puzzle Numerical Ability

Solve the following system of equations using the substitution method. Be sure to state the solution to the system.
2x=3y=7
y=-2/3x+3

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exam Other Question

please show me how to do this problem! If y varies directly with x, and y = 10 when x = 15, find y when x = 6. What formula do you use to put this in vertex form where you can graph it? What are the "zeros" of this equation? and how do you find the "zeros".

f(x)=-3(x-2)^2+5