exam Maths Puzzle Numerical Ability

Solve the following sytem by substitution:
4x - 12y = 5
-x + 3y = -1

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exam Other Question

Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = -3x + 1.
y = -1/3x + 5
y = 3x + 5
y = -3x + 5
y = 1/3 x + 5 can any one help me find the slope for each line? 1. y= -3/4+7 m= 2. x=y m= 3. 3x-8y=4 m=