exam Maths Puzzle Numerical Ability

The directions says solve the problems using subsitution. I need help solving

y=x+4 y=3x.

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exam Other Question

Solve the given equation using synthetic division, given the roots indicated

4x^4 + 28x^3 + 61x^2 + 42x + 9 = 0 (-3 is a double root) When graphing exponential and logarithmic functions can the lines pass into the 3rd quadrant?