exam Maths Puzzle Numerical Ability

Hello, can anyone help me with this?

Solve the following system by graphing.

x + y = 6
x - y = 3

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exam Other Question

Given that (3x-a)(x-7)=3x3-32x2+81x-70,determine the value of a. A market vendor wants to mix the liver and the gizzards of chickens to have 40 kilograms of assortment worth 120.00 per kilogram. The liver costs 110.00 per kilogram while the gizzard costs 75.00 per kilogram. How much each kind must be mixed?