exam Maths Puzzle Numerical Ability

What steps are needed to graph the lines lines: y = 0.15x +0.79 : y = 0.11x - y = -0.85

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exam Other Question

x2+y4=3(z+h) find the y-intercept of the cubic f(x)=(x-2)(x+1)(x-3)

my ans was (0,-6)

was I right