exam Maths Puzzle Numerical Ability

i am trying to the

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find the standard form of an equation for each graph described

slope = 3/4,y-intercept = -3

my try: m=3/4 (-3,0)
y=3/4x + b
0 = 3/4 x -3/1 + b
0 = -9/4 + b
9/4 = Complete the ordered pairs for the equation y = 5x + 10. (0),1/5) 0-15=0, 1/5?