exam Maths Puzzle Numerical Ability

I tried this over and over and can not get this:

Solve the following system by graphing:

3x - 6y = 9 :EQUATION 1
X - 2Y = 3 : EQUATION 2

Y-INTERCEPT AS AN ORDERED PAIR =>

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exam Other Question

Find the x-intercepts.

y=x^2-2X-15 if i have equ:

k = m + s + x + y + z
how do i solve for s?

s = ?

All you can do is get s by itself on one side of the equal sign. In this case, subtract the other terms.
s = k - m - x - y - z