exam Maths Puzzle Numerical Ability

graph 3y=2x+6
graph 5y+x=-15

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exam Other Question

plot the graph on the function f(x) =6^x The length of a rectangle is 1 cm more than 5 times its width. If the area of the rectangle is 79 cm2, find the dimensions of the rectangle to the nearest thousandth.

I get so confused on these questions. I am just lost on this. Please help!!!