exam Maths Puzzle Numerical Ability

What is the gradient of the graph of the linear equation 7x-4y=28?

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exam Other Question

(4a/a^2-ab-2b^2)-(6b/a^2+4ab+3b^2) if y=-240 when x=40, what is y when x=19?
a. 114 b. 3.2 c.-114 d. -3.2
if y= 3.6 when x=-1.8, what is y when x =-2.75?
a. -5.5 b. -1.38. 5.5 d. 1.38