book Maths Puzzle Numerical Ability

Write an equation in slope intercept form satifying the given conditions:

passes through (-4,7) and (2,4)

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book Other Question

Keith weighs 20kg more than Beth, while Henry weighs 30kg less than twice as much as Beth. If Keith and Henry weigh the same,how much does Beth weigh(in kg)? factorise on the left hand side 6x2-11x-3=0
(in english the question reads six ex squared minuss eleven minus three equals zero)
it would be great if you can e mail me the answer