exam Maths Puzzle Numerical Ability

HI, could I get some help with the following problem. The question is: Find the ordered pairs and graph the following equation. x + 2y = 4. Thank You

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exam Other Question

simplify (2x^4+3x^3y^2+x^3y)+(x^2y)

i divided everything by the (x^2y) and i came up with 2x^2+3xy+x
but since it looks like an addition problem im not sure how to work it out The total cost of producing x units is c = 3100+25x.
Selling price per unit is $37
How many units should beproduced and sold to gain a profit of at least $2000